Thousands Spent But Still A DPF Fault!? You Won't Believe The Cause! Peugeot Boxer 2.0 P2463 B1029
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- เผยแพร่เมื่อ 5 ก.พ. 2025
- fault codes in ecu..
P2463 Particle Filter
P24A4 Particle Filter
where nobody checked was the BCM.. B1029 exterior temperature sensor fault that is located within the wing mirror.
The ambient air temperature sensor innthe mirror causing adblue and DPF Faults due to the system relying on the temperature reading to operate correctly. Adblue tank require temperature for in tank heater etc
TBH if a Irishman Mechanic told me that i had to change the wing mirror for the DPF problem, i wouldnt have believed him either.Excellent content.
Same here! Guy know his stuff for sure. And on a side note, what a stupid place to put that sensor.
@@tilerman That's really a stupid place to place the the sensor in the wing mirror
❤😂
What a nicely veiled insult. What has the fact that he's an Irishman got to do with anything? You are no doubt English. Hardly a surprise.
Amazing to see that not one of the previous garages googled "external temperature sensor" just goes to show we don't have any mechanical brains anymore, just part fitters.
That is why a real technicians study wiring diagrams.
18 year old kids with Halfords spanner’s
Unfortunately modern cars and trucks only work because of dozens of closed loop circuits which require some reverse and logical thinking to fix. The primary qualification for fixing vehicles is electronics and industrial computing. Secondary to that is being a mechanic. The 2 are not really compatible.
A mechanic may work through a check list to clear run of the mill faults but without detailed understanding of how the system works as a whole complex and unusual faults will never reveal themselves.
Some were at least going back a few years. My father was an outstanding mechanic but left the trade when the garages went over to replacing whole units instead of repairing the old ones. I worked with him on his private customer's vehicles from when I was 9 or 10 until he'd had enough in his 60's and we did everything from servicing to engine overhauls. I serviced and maintained my vans when I had a same day courier service and I still maintain my motorhome and everyday vehicle now. Dad is gone now but he taught me well.
Either you're too young to remember when real mechanics existed or you should take your dog mess covered glasses off.
@@reverendjohnowen You have missunderstood the thread as a whole. Read all the comments again nice and slowly. No one is dissing mechanics.
Everyday is a school day, you learn something new! Didn’t know a external temp sensor could cause a DPF issue
right, but the guys at Citroen/ Fiat/Peugeot garages should know...
Car manufaccturers: Let's make computerized systems for the cars that can detect everything on a car and stop random things working without actually telling anyone what the problem is directly.
My next car will be from the 80's.
That's what I was thinking! 1980 or earlier.
You don't know what the problem is if you're, let's say, less inclined to have a great number of neurons. Diagnosing a car has never been easier. That is, unless you're a boomer that looks at computer as if they've got seven heads.
@@tobiascat6173 You need to improve you comprehension skills. Both for reading and understanding comments and then, to properly read manufacturer walkthroughs.
And as if that isn't enough, your need to add a "fact" to the end of your sentences, trying to convey some more importance to the word salad you just wrote, tells us everything we need. Your knowledge about these subject is at best limited. That is indeed a fact.
Incompetence, sadly is everywhere and dealerships are no exception. If anything, they seem to concentrate inept people.
Run the rings you want grandpa. Couldn't care less. You just confirmed every single stereotype there is about your kind.
Next time try reading about how the fault systems work and how they are standardized. Might save you from looking like a fool in the future.
Yea, tax & mot exempt !
@@mudemmeonick Easier.......... Riiiiiight.
I hope the customer reflects on the situation 😊
The customers wallet is reflecting on the situation not to mention the inconvenience of no work vehicle and the lost customer $$$
Yeah he's been winging it for far too long now
Nice to see a genuine mechanic that knows his job great work!!!!
Brilliant,,, people are not paying for your time they are paying for your knowledge !! ,
Wow! Don’t get me wrong, I’m not even a van owner But have thoroughly enjoyed watching your videos and your diagnosis process and was an eye opener to see a wing mirror can affect the dpfs operation! If only this chap went to someone like you first! & why I only trust a few diff ppl to diagnose any issues on my car that I cannot! Well done Sir! Keep up the good work 😎🙏🏻
I have found that ambient air temp sensor is a critical sensor for a many components in a modem day vehicles (especially diesels). The two one's I have come across was the first one I had, the parking sensors where not working (parking sensors need this temp sensor reading in case snow or ice may be present on the sensors which may cause unnecessary sensor activation). The second one was for a AdBlue concern. (as you may know, the AdBlue system needs to know the ambient temp in case of AdBlue freezing for heater regulation).
Good video and excellent information, subscribed.
You're right, I had my entire AC system in my Astra stop working after hitting a bird at high speed. The bird took the wires off the temp sensor behind the grille, and luckily as it was a hot day I noticed the AC stopped blowing cold immediately. I thought it had punctured the condenser and dumped the gas but was surprised it was still holding pressure. Only after replacing the exterior temp sensor did the AC start cooling again. That car is not new and surprised me that there was a connection in the vehicle software.
WOW! Attention to reality instead of what a screen says. Jimmy that was some Jimmy Potter wizarding! Great find
Nice one Jimmy 👏👏 If it wasn’t so tragic that this chap had spent so much money to rectify the problem this would be laughable, it seems to me that most garages just throw parts at them at the expense of the owner and need to be held accountable if they can’t find the issue, let’s face it the answers are out on the Tinternet Web Thingy with a little bit of searching, I know these modern vehicles are a minefield of electronic wizardry that even the main dealers seem to struggle with, though they should have the training and specialists equipment for their own brand it seems to make no difference to the problem solving, I’ve heard so many similar stories to this one especially with reference to the Transit customs.
Keep the content coming Jimmy 👍
You got that spot on, it's so true no accountability, it's disgusting 👍👍👍👍👍👍
Modern engines are a nightmare , my old Banana engine did 350,000 and never failed and is still running well with it's new owner in Wales !
@@curtisducati same as that mate I had two Smiles and 3 mk6’s & all done close or just over the 300k mark the last mk6 had done 100 miles under the 350k so you just beat me 👍 the engine was still going strong but got to the stage when I was fed up of laying on my back welding the thing up for each MOT.
Was in Shopfitting for 35yrs so they were all motorway milages & thrashed every day.
Next doors Vaxhall van hits 400 miles and a fault shows up. The things been back to the dealer more than on the road. Did it from new ,its on a 23 plate, it's the same as this one only badged as Vaxhall.
Motor trade full of imposters now
I'm totally team O rileys!
Had this on a 2.2 transit with a broken wire to ambient temp sensor. Caused all kinds of problem. Can't believe mechanics don't think that sensors irrelevant. Another nice diag. See you tomorrow in the next one! 😉
Thanks for sharing
Well mate, ive watched lots of your videos, and ever time i learn something more, your knowledge and skill is a huge benefit to a home mechanic like me trying to navigate modern cars thank you do much 😊
Great to hear!
This is why people need training to fully understand how these DPF systems work. I hate them I think they’re shite, I’d love to do an emissions analysis on what’s coming out when a regen is performed. But there’s no going back in emissions laws now so people need to get trained better!
Top job mate you really showed how diagnostics should be performed
Hi jimmy
I spent thousands on a 66 plate transit with dpf issues. The outside sensor went missing when in a ford dealer .
Sent the van to a so called ex ford man who changed adblue injector cost £600 . And I was told I needed new
Dpf . I changed the dpf myself only to have the problem reappear a few hundred mile later .
It was only one of your earlier videos that help sort the issue. Man you should be off tools teaching mobile
Mechanic in your franchise business.
Cheers Tom
Thats great So what fixed it for you?
The outside temperature sensor reset 👍
I got a 66 plate transit and had a ad blue problem and ford couldn't find the problem and they took the piss with van because they had it for months and i ended up getting the adblue remapped out but i wondering now if it is the external temp sensor that caused it 🤔
Thankyou so much, been scratching my head over this, and yes I had changed the mirror without a sensor as aftermarket. Luckily I kept the old one so I can fit it. Sir, you are a life saver!
Great to hear!
Good fix. The difference between someone who thinks they know what they are doing and someone who does know. Very informative.
Garages are there to make money
With or without even fixing the problems
They change this sensor and that bolt and what ever else clear the codes and your on your way not knowing they have had your pants down
Well done Jimmy 👍
Keep em coming
I think telling someone it is the wing mirror is confusing because it isn't the wing mirror it's self but the temperature sensor inside/attached to it. New vehicles are so complex with all the sensors.
Good job Jimmy, I bet he very happy with you when it was sorted.
If I ever had a DPF issue I'm pretty sure I'd come to you to sort it. 😄
I agree with you, too many sensors!!! I preferred a dumb diesel, that starts, runs and stops when I tell it to!!! Had a VW that ran for 260,000 miles, no probs, then a mechanic reckoned I had a diesel flow issue and fiddled something to make the fault go away. Then, after turning off the key and removing it, the engine continued to run!!!!! Outstanding fuck up!!!
What a fix - Well done, saved him a fortune in lost business let alone bunging DPF after DPF on it
Must have been some find the first time you did it!
Modern cars are complicated and many systems depend on each other..
Thankfully there are some of us who are interested and willing to scratch our heads a lot :D
I've know this trick for years.
Another great video, I work on commercial vehicles and see this problem all the time, a lot of sensors are in the mirror housing and there always getting hit, keep up the good work, as always great to watch and very informative.
Thanks for sharing
I'm replacing my old 2002 van and while at a used van outlet yesterday I looked at a dozen or more vans from 2013 - 2018 ..I noticed they all had a certain strange industrial (unpleasant) smell, do you know what could be causing that smell that they all had in common?
If they all smell like that I'll keep my old van.
I'm sure I've come across topics covering adding temperature sensors to the older boxer that didn't have that function activated. I think you can just buy an appropriate thermistor and use that. you'd just have to get hold of a sensor used in a factory mirror and measure the resistance readings in 2-3 temperature point and then put the reading in an online calculator which will tell you what thermistor code number you need 👍
NTCs come in standard values, measured at 25°C, the temp coefficient as you said can be calculated from different readings (easy to get accurate 0°C with ice in water, then ambient temp with a thermometer). When you have the right thermistor, solder wires to it and pot it in silicone or epoxy (for weatherproofing). The thermistor itself costs less than 1 euro at Farnell, TME or any large electronics parts distributor
I will tell my girlfriend that. I am sure she will understand every word of it [sic].
@@brainndamage I use a decade box connected in the circuit and as you adjust the resistance you can watch the temp reading changeing. good simple diagnostic tool
Wow this is eye opening I’ve watching your channel for awhile now and love the information you give
I have a 2006 2.5 Vw crafter and it’s a minefield trying to work out what is going on with them
Keep up the great work
Yes VW are an expensive PITA to fix. I gave up on them and brought a new MAXUS Deliver 9 and its been easy to work on with the rear wheel drive. 80.000 KM and goes awesome. I do change oil every 10.000 km NOT the 30.000 km dealer bullshit still with the high spec oil.
just fitted the temp sensor I bought from eBay which cost £10. I hope now that I have a temperature displayed in the van it will run as it should. Excellent work! Many thanks for the video!
You learn something every day, bloody hell. Well done mate , you certainly know your stuff !. Regards from sunny Devon.
Cheers 🍻
Well he did go to Halfords and kwiikfit, what did he think would happen? That's like going to a pool party at Michael Barrymore's house and expecting good things to happen.
Great comment Rob! Tyre's and wiper blades only?
@@TimmysFavs if youre lucky they might do tyres and wipers properly
Would ever let anyone touch my car at any of those two places. Only use Halfords for a car polish when I need it... 😊
@@nickbourne3202 their halfords socket sets are actually very good but I wouldn't want them touching my car
You should really get a THANKS button, as I am sure many would thank you that way if they got to fix this problem by changing the side mirror with one that has a sensor
Thank you sir, over in NZ with one that had dpf issues. Noticed thanks to you it has a cheap replacement mirror with no sensor and reading 000 temp 👍
Glad it helped
Good job, I’d no idea the external air temp was used by so many systems in a modern car!
To get a true reading it’s got to be external to the vehicle though which immediately makes it vulnerable to damage wherever you put it, putting it in the engine bay would make no sense.
Ironic it’s in the mirror though, perhaps the customer should take the old one to the previous garages so they could take a long look at themselves for not sorting the issue themselves!
Just valeted kangoo van yesterday ...was wondering what the strange plastic dimple is underneath wing mirror .now i know....brilliant stuff very educational...thanks
I was involved in the external temperature sensor at a vehicle manufacturer so I'm not even mildly surprised that it caused this error, but it's annoying that they couldn't figure it out.
I have the exact same problem with my 63 plate boxer. Had new dpf to get through mot. Not long after problems reoccurred. I mentioned to the mechanic does the van need to know exterior temperature as mine was not reading. He said no it’s just a temperature sensor shouldn’t make any difference. Part of me thought shouldn’t everything be functioning as per manufacture. And I was right. Thank you so much for your video and knowledge.
this just goes to show as i have all ways say experience is what counts and this gentleman has it in abundance
I ran my boxer for a year with a faulty external temp sensor with no dpf faults,eventually replaced a few months back with one of ebay for around £10 and it works fine.
Well done mate and being so honest about the repair to many scum bags start garage businesses and seriously haven't got a clue ..
Up the reds!
Well done fella if people only knew how long it takes to obtain your knowledge !
Brilliant video! I use a Citroen Relay for work and my driver's wing mirror has cracked around the plastic indicator. Was considering purchasing a replacement off ebay, will definitely not be doing that now 👍👍👍
I'm sure I just saved you months of headache. I've seen this story a dozen times now. Just the ones that came to me so God knows how many people are suffering with this issue
So glad you operate in Bedfordshire! Very reassuring to know i have a competent mechanic on my doorstep.
Bedfordshire 😮
Where is he then...?
Valuable information , thanks so much. To be honest if you told me that as a customer I would think you were pulling me leg 😀
Glad to help
Brilliant I thought as I watched the start of this vid! Have already spent big time to try and solve the dpf issues on my boxer. So out to the van and searched the mirror, and searched the mirror again.... and again.... not a sensor to be seen, just a nice smooth casing. Looks like the base model that I own isn't actually fitted with one....
Does it read the temperature on the speedo?
Might have been replaced with the wrong mirror as what happened here
That is an odd fix and makes me wonder where my external thermal sensor is (old petrol car, no DPF needed) but the way you explained it to us was much clearer than what you told the customer!
We fitted an aftermarket mirror to one of our relays, but noticed the display so transferred original sensor out of remains of the oe mirror but pulled the loom back and tucked in the door as there was no channel for it, worked spot on 😂
This is a big problem with modern vehicles, basic workhorses are far too technical, electronic, and full of gadgets, I believe to keep people away from DIY and what we used to call "under the arches" mechanics, and force owners to literally waste fortunes with dealers, It's a sad state , I know my way round engines, but all the modern computerised techy stuff I just don't know about, and that is why I would never actually buy a new vehicle, I just lease hire. Well done Jimmy for being a decent honest guy, with a good knowledge. In my experience of modern garages and dealership garages there may be one guy who can actually read who is the "foreman" and a few under experienced grease monkeys who just do as they are told, and their hourly rates are eye watering, simply another case of ripping off the motoring public.
The actual sensor component is probably available for pennies or little more from an electronic component supplier. It would be informative to investigate the actual resistance at various temperatures and check out what's available.
I've replaced the wing mirror sensor on my Citroen C8 using a genuine sensor from a Citroen dealer. I bet it's the same part
Well done shows that some dealerships don’t know what they are doing change this change that and they still don’t know my comment is electronics in any vehicles pain in the backside
Exact same thing happened to me! Got a Toyota Pro ace had the DPF warning light come up. Took it to Toyota. They said it needs a new DPF for 3 grand. Nothing else they could do. Took it to a second company to get a deep industrial DPF clean that lasted 3 months then it will clogged up. Took it to four other garages who cleared the codes? Tried bits and bobs. Nothing worked
. Eventually found a good one around the corner and they said that the ad blue inject was blocked so they fixed that. But it was still having a bit too much soot build up. Put a new wing mirror on. No problem since! Absolutely insane design!! I couldn't believe it either when he told me about the wing mirror!
I must admit, I'm not sure I'd believe you about the wing mirror causing the dpf issue, until you explain how it works. Nice job !!
Thanks!
Thank you so much for this video, I had exactly the same problem and solved it in 10 minutes after several failed dpf regens
Glad it helped
Instead of changing a complete mirror you can dismantle mirror and replace temperature sensor with a generic citreon one of ebay for £9.99 just cut ends of the plug and wire 2 ends on to them. Doesn't matter which one is which. Worked for me!
I was wondering that if you could just get a generic temp sensor and wire it in. Seems alot cheaper than the alternative!
Hello from a Pensacola Florida! I myself was a dealership technician before I got out of the trade. It seems like good diagnostic technicians are a problem world wide. A very basic inspection would have told anyone with a brain what the problem was. Unbelievable.
Your pulling my leg 🤣😂😂😂🤣 hard to believe a wing mirror would create a years worth of pain. Great fix
😁
This is a great video, and you are a great bloke. Very interesting. You have a mischievous streak in you though, you were really teasing that poor customer at first, knowing full well he would think it absurd that a mechanical engine fault would be fixed by getting a new wing mirror! Was funny though. Best wishes from England.
wow you are genius! would love to see showing the reaction of your customer afterwards
7:42 wow this was insightful Jimmy..
You are nothing les than a Legend..
Wish you were closer to me I'd be straight to you for sure. .
Not meaning to sound daft but I take it this is generic issue across the board ?
Makes sense it meeds to read the surrounding air temp...
I have a 2ltr insignia ecoflex...
Lets just say its getting on my last nerve...
Too many sensors..
Great videos I enjoy seeing your honesty..🫡👏👍
Just AWESOME 👌 👏 😎 Respect to you Jimmy, we need lot of you around 👌👍🏆
I appreciate that!
I remember this issue you found on my van,, which was stuttering in the morning when cold,,,
I actually bought the sensor, separately amazon, perfect, no stuttering in the morning
This vehicle it wouldn't have worked as the mirror had been changed already to one without a wiring harness for the sensor
I had a 2016 Boxer van with 40,000 and the engine blew up (thankfully fixed by our dealer) but it had dpf faults nearly every week of the year we had it. I wish I had seen this video back then. I was glad to get rid of it.
Sound like you had a dodgy one or unsolved issue. 140k on mine and no serious problems
Now i know why my BMW 530D which i sold almost 3 years ago had so many DPF issues. The outside temp sensor never worked all the time i had it.
Jimmy I seriously need to bring my car to you. Had an ongoing issue for a year and no ones been able to fix it. Been to specialists etc no luck, I believe that you will be able to do it.
We come across alot of dfp problems where garages just replace sensors and installing new dfp filters. Some even replace turbos and injectors to try to solve this. They never look at what the conditions have to be to get a filter to regenerate. We do alot of BMW and most of the times it is the thermostat that is stuck open, So the engine will not get hot enough to regenerate. Also the fuel level has to be high enough to activate DPF regeneration.
Hi for future ref you can buy the temp sensors and solder them in.
No wiring harness on the old mirror
Beside being a credit to the industry Jimmy and having a brilliant easy to understand videos
10/10 mate,
But Jesus £700 for a wing mirror 😢
I'm a sad person who is greatly impressed by the little hook on the mirror
A designer actually thought about something
Couldn't you just wind the window down and hold it in place?
I do notice the video is old but if it helps anyone...I was recently involved in a Japanese car (Mazda I think) that refused to regenerate no matter what because it had a DPF fault code. It was possible to erase the codes but once the engine was started it came back immediately despite telling the car it had a new particle filter. I've been working with computers for over 30 years and realized the programming must be that it remembers the error code and then checks if the filter has been replaced upon start or still has the same values. So we again told the computer that it had a new DPF, unplugged the hoses to the filter and started the engine. Codes stayed away but of course now generated others. Stopped the engine, erased the new codes and voila regeneration started all levels then ok and problem solved at 0 cost. The alternative here would have been a new filter at an insane cost. In addition to being a mechanic you now have to understand computers and programming to trick the computer. This code is only there to prevent anyone from cheating and my guess as far as the temp sensor goes is that you could probably bypass it.
As a boxer owner. This is invaluable info. Great video...
Glad it was helpful!
Another Diagnosis and repair that benefits. Us mere mortals. Thank you and Amen. See you in the next one. 🛠🛠
Well Done , I had a diesel 1.6 , which gave problems that couldn't get to the bottom of spent loads of money on rectifiable jobs , to do with sensors , D P F , E G etc , then developed injector problems, in the end I sold it for well below its true value & went back to a uncomplicated 1.2 eco petrol engine , Best thing I ever did , but interesting video highlights the true problems with some diesel engine vehicles and the complex set up , great when there working as they should but nightmare and expensive when things start going wrong .
Jimmy is the dpf king amazing nobody matches him on TH-cam 👍👍.
You are an extremely knowledgeable man 👍
Back in 1988 I had to call out the AA to my broken down MG Montego. The chap said "these modern cars are a nightmare so we have to look for things that appear to be out of place". He quickly found a broken wire in a plug wrapped with blue insulation tape. Problem sorted. My 2007 Sprinter has given me plenty of headaches which I have successfully resolved, thanks to my dealings with the chap from the AA all those years ago.
Wow thanks for sharing this with us all. I storing my pig wee in the garage so I’m ok. I’ve got a brand new car and definitely don’t want to ruin it 👍
Very interesting video.
I'm glad that my old Peugeot diesel car doesn't have a crappy DPF filter on it.
I've kept my car for almost 10 years and self taught myself all about mechanics.
My car is almost 20 years old and I wouldn't want to change it for a more modern car otherwise I'd have to invest in £6000 for a scanner like you have in this video.
And that's not going to happen 😂
Great point!
Thought you had stopped making content, had no notifications, no TH-cam pop ups for like 4 months now untill now even though subscribed and have the bell on!!!
Welcome back!
You are mechanic Doctor ! Great job ! 👍
Thanks! 😃
Well now every day is a school day I often wondered what those little Nipple yolks on the mirrors of my van were for Thanks
See this quite often on delivery vans I work with where the door is opened and closes more times a day than most people do a year and the loom goes between the A pillar and the door connectors it’s one of the first things to look out for with these issues 🙈🙈
Great job Jimmy, all the best.
I’d NEVER have guessed that was an issue!
Great content I can't believe the cost of a replacement mirror 😭
The Exterior temperature I assume is the Reference Level to where the rest of the vehicle sensors if required can assess calculated differences and operate within those perimeters. Good Find .!
Goes to show having a good quality code reader is a MUST.. I’ve got about 6 readers just for DIY of mine and mates cars
Hi there, I've just bought a '22 plate Relay with 2.2L AdBlue engine and have just found out about all this DPF stuff. It seems to me that allowing the ECU to carry out a forced regen can "poison" the engine oil, and that with good management and driving style, it is possible to blow the weeds out in a less nasty way. Is it possible to suppress the ECU from carrying out a forced regen via an OBD scanner, ideally the £300 model? Excellent content by teh way.
Well well well. I watched this video a couple of months back. A couple of weeks ago my daughter-in-law-to-be had a very wierd problem with her Fiat 500x. The window switch on the driver side for the passenger side window wouldn't wind down the passenger side window but the passenger side switch would. Eventually changed both switches and still same. Diagnostics at Fiat proved it to be a failed external temp sensor in the passenger wing mirror. Replaced mirror and all ok. It had also knocked out her air con.
Wow, didn't know about the exterior temp sensor. Great tips too. Subbed!
Thanks for the sub!
It's also used for TPMS on PSA vehichles
Yes amazed lately how the exterior temperature sensor can be so involved in engine management
Brilliant video, loved getting educated by you.
Glad you enjoyed it!
I never knew that! I will definately remember that one!
Great work… although absolutely no need for a new mirror, it’s a 12v thermocouple probs a few quid tops.
Curious to know if it regens on its own now, I have similar troubles. 10k thermistor from RS is a good replacement for the often missing temp sensor, the eBay Chinese sensors are a waste of money and don't work.
Easy enough to put a resistor into the wiring to mimic the temp sensor. Just try a few till you get about 15 degrees or whatever it needs to allow the regen. Fixed for a few pence. You could even get a proper mirror temp sensor from a ford wing mirror or whatever. They're all the same sort of thing.
Very interesting video Jimmy, same vehicle, I'm getting fault code B1029, outside temperature short circuit to positive or open circuit, I'm thinking maybe the wiring where the door hinges are, open and closing might of broke a wire...?
I smashed the indicator light on wing mirror then all of a sudden dpf light is on and in limp mode is that right jimmy
Thanks Jimmy excellent find 💪
As the number of sensors have increased so have the number of faults and false alarms.
I love analog days and the simpler vehicles.
Those temp sensors effect so many aspects of the vehicle. Good on ya buddy. 👍
Yes they do
one of the best vids i have seen and so genuine
Thanks
Beem running my boxer with no outside temp for nearly 4 years, didnt know it was so important. New mirrors ordered!
Had the same issue with a Honda civic sensor behind the front bumper access remove the whole bumper to get to it or chop a small hole get long nose pliers rip it off pull cable out for new sensor pop it back in and then cable tie it to the grill . Worked perfectly well after the sensor was replaced it would show random temperatures bearing no relation to the actual temperature.
I would never have thought there would be a temp sensor in wing mirror either or it wpuld affect dpf regen intetesting stuff Jimmy👍