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P0299 Underboost - N75 Valve Diagnosis and Replacement - VW / Audi / Seat / Skoda
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- เผยแพร่เมื่อ 17 ธ.ค. 2020
- Welcome back Bluudies to the channel. In this video I finally track down the fault putting my van into limp mode, bring up code P0299 Underboost. I look and test the vacuum side of things in this video, testing the engines vacuum operations, hoses and the N75 valve. The valve cost me £43 delivered for a pierburg OEM one, not the cheaper £20 Ebay ones. That is what ws fitted previously and caused the issues. The vacuum test cost me £11.50 off ebay.
Hope you enjoy the video.
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Looks like I'm having a very similar issue with my 2010 Touran BLS...
The OEM N75 seems to have packed up...
Once I bypassed the N75 and put the vacuum pipe directly into the actuator, the car is back to being a re-mapped beast as it should...
With the normal setup, she's barely able to pull herself...
Good, and clearly shown content anyway, fair play
Thanks very much
Since owning a Volkswagen with a BLS engine I could practically become a VW tech
Same with a bhw
Great vid pal my van was doing followed your vid on off chance bought the n75 vacuum valve and solved my problem cheers 🥂
Nice! Well done fixing it!😎 I need to grab myself a vacuum tester, although my ECU throwing errors regarding MAF sensor and egr valve. So I think my under boost problems lies with the egr valve. But first I'll start cleaning the MAF, hopefully it's the MAF or else it's going to be a awful lot of work😅
Egr may need a clean too. Be a good fix if you can just fix it by cleaning. :) good luck
Hi mate, got the same van with 120k on it, noticed with way making a noise when changing gear, a quick google and the n75 valve came up, swapped for a pierburgh and the vans going great! Pulls like a train up to 90mph! Cleaned the egr tonight which was clogged up, I’d imagine yours will need doing at some point. Keep the vids coming!
Same haha, it starts making very wierd turbo like noise. my n75 was so rotten i tried changing the hose and the valve literally broke in 2 pieces. Changed it for a new one and issues are gone
you "bluddy" love making these "bluddy" video`s dont ya 👌👌👌
Sure do :)
hi blundy just bought and fitted n75 valve thanks its working great now . come see me at tatton park vw show this weekend boo's future classics
Thats good. Glad it worked out for you.
Thanks for this video man! A week after I ordered a new van for work, my trouble free 2013 T5.1 decided to shit its pants, (I swear they know!) This video has been of great help. 👌🏻🍺
I'm glad :)
Well done mate fixing this fault . I loved watching this video it was interesting all the vacuum pipes etc 👍
Thanks dude. Glad you enjoyed it.
Hi just watched your video on changing the n75 valve on your T5 finally someone who knows what the noise was after turning my T5 engine off . I've asked loads of people no one ever knew what the noise was mine is a 2010 and been doing it for seems yrs . Just wondering if I can get away with changing the valve and not after mess around with any ECU fault resets
Nice good fix glad you got it sorted mate 👍
Thanks Mike. Im glad its finally sorted.
@@bluudysgarage your welcome mate yeah I bet your glad can drive you mad trying to find a fault son got a water leak coming in back some were
Good job using the OEM parts, the copies always fail with these N75 valves.
Yeah. Its not like it was expensive really.
Will this cause my brake pedal to be stiff the next morning or after a few hours the car is off?
My crafter (Named Hitters Revenge) threw up the same codes and performed exactly how your did under load it just goes into limp mode. changed the N75 and no difference so the investigation continues
Hi, Ive recently brought a t5 2.5 and it has the over boost issue. I've cleaned turbo with oven cleaner and actuator lever moves freely with hand. Only happens when over 2000-2500rpm. Is this down to a faulty n75 valve?
Great videos by the way 🙌
Any joy? Mines same just bought an n75 valve mine goes into limp mode mainly in high gears on the motorway and glow plug light come on flashing
good job where did you buy the pierburg valve one from please do you have a link
Hi, I came across your video, very informative and guidance is great. I have a VW T5 2007 (56 plate) 2.5 TDI LWB with this issue. Trying to find the N75 valve part is a nightmare. I got the vacuum kit and will be doing the testing this evening following your process. One main thing is I do get smoking, along with Limp mode, lag but only the P0299 code. Would you have any references for the N75 valve I could use? TIA
Your videos are sooooo much better to watch when you don't keep doing them silly voices you do 👍👍
Not sure which voices you mean... but I am who I am.
👍👍👍
@@bluudysgarage the silly voices rock dude !!! great content
Just rewatched this as my cars throwing up this code now. But am I right to assume that this fix will only be good for vag group cars as mines a Ford Focus
Greetings from Denmark. Nice structured style video fixing the underboost. BTW The N75 looks for me like a chinese knockoff with a nice label on it. Real N75 Pierburg valves have some numbers, the Pierburg text and the logo moulded in the housing. But its nice that it works.....
The one I removed was a cheap ebay one. I replaced it with a genuine pierburg one.
@@bluudysgarage I will repeat myself. The one you installed looked fake to me....but as long its works, everything is ok.....
Like I said it was genuine part with paperwork to match.
Thanks you. You saved my head from much headache I replaced mine problem solved
Well ive a skoda 2016 ive got the same code there for underboost bug i all so have P13D600 Thats a glow plug with pressure sensor would that cause inder boost
I have a 2005 Volkswagen Passat TDI first start the car drive drives good take off is eh once the turbo kicks in it takes off sometimes 10 minutes sometimes 15 minutes sometimes five minutes turbo trans off causing the limp mode put the scanner on there was four codes One for the msf One for that n75 I don’t have a vacuum tester but when I shut the car off turn it on for just a second turbo kicks right back on and then after five 10 or 15 minutes goes back in the lint mode what do you suggest n75 Thank you
thank you, your video saved me a bundle!
Thats great!
I replaced n75 on passat.. After testing a lot it seems my valve is constant at full vacuum. All pipes good, everything clean, new valve. Any idea?
I got the same issue with my Passat 2.0 TDI and I’ve done exactly what you did changed the same part Peirburg but the issue still the limp mode goes on and still the same fault code P0299..any advice
I got the same problem on my t5 bi turbo all was fine then it dropped a vave put a recon engine and new turbo in and now got that same code and problem not even vw no wots up with it
Did u fix it I am a vw specialist but I’m south Scotland
Same story, recon engine new turbo, and same issue :(
Did you figure out what it was? I have a t5 bitdi with the same limp mode crap going on
But or I think the n 75 valve cannot move the A turbo actuator enough
just 1 centimeter. .
Do you think if i change n75 would be ok?
do you think the turbo actuator should all the way up?
when the car start
also i didn't find any holes in vacuum pipes
any idea what should I or could do
thanks
and also this came up from computer 19586 - EGR System
P3130 -35-10- Regulation Range Exceeded-Intermittent
17964- Charge Pressure Control
P1556 -35-10- Negative Deviation-Intermittent
I’ve got the same vacuum tester. I’ve used it to change brake fluid 😆
Great idea if it works!
@@bluudysgarageThat’s what the pot is for in the kit. Suck the new stuff through, just keep an eye on the reservoir.
I've got one too. For the brakes. Wasn't impressed so got the reservoir pump.
Not a waste of money now I have been given a new use for it.
Hi there. I wonder if you can help. I have an overboost fault and issue that I can’t seem to solve. I’ve replaced the turbo, as the old one was seized, and boost pressure sensor had been changed. But the van continues to flip into limp mode when driving it (up hill or under load mainly). I don’t know what else to try or do. Any help greatly appreciated.
Hi, thanks for the video. Is it possible to diagnose the N75 valve fault by disconnecting the air-mass sensor plug?
@AbsoluteModictsSport
When you was testing with the pump, was you plugging it into the top part of the valve which goes down to the turbo?
How long has it took you to get a new N75 valve from buying the van. Surly it don’t take weeks n weeks to find that out ??
Videos are staggered out. So not as long as the timeliness on youtube. But I bought the van as a camper project not as a daily driver. So most of the time is spent just sitting on the drive.
Would it be possible n75 could be faulty without a code
You telling us what issue it had is like you was describing my van lol. Did the coil light flash by any chance?
No afraid not.
@@bluudysgarage I changed my abs sensors as 2 of them wasn’t working and it doesn’t go into limp mode as often now. I have just ordered the solenoid though hoping it’ll help my turbo lag
Hi i need help i change n75 and test and it good but still not open?
So I’m confused cause shouldn’t you have less vacuum going to the turbo from the n75 on idle and more as your rpms go up to open the vanes. I have a 2006 1.9bew and I have p0299 code smoke like crazy till I go over 50 then goes into a limp mood kinda. I have 20bars of vacuum on idle and then goes down to about 10 when up to 3k rpm
Not it shouldn't. Your losing vaccum. You have a leak or a faulty sensor
Thank you !
Congrats on fixing Alan. It does pay to use OEM parts.
Thanks man. Sure does.
Is overboost on a BKD engine always the turbo vanes sticking?
Can N75 fail without any error codes?
I got The same p0299 but i hear noise grom The smak.turbo
I have a 1.6 tdi Skoda and I have the exact same code exact same problems (when limp mode occurs etc) I changed this part and limp mode still happens in 5th gear where should I look now ? I took to a garage and they tried telling me my turbo has gone but I know it hasn’t
If your turbo is working in the other gears then its most likely not that. If its happening when in your higher gears then its when your engines creating maximum boost pressure for a longer period of time. Id be checking for vaccum leaks on the accurate pipe work or splits in the intercooler or pipework.
@@bluudysgarage great thank you for your help 👍🏾
they will always say turbo everytime because they cba just look into the problem because its not an expensive fix an a new turbo they fitted will rack up a bigger bill for them
Have you got a link for that creative code reader please 😇
Is this whats referred to as the ‘moo’ valve due to the noise they can make when turning off engine?
It sure is.
Hi mate similar issues with my 08 caddy, 1.9tdi pd105 BLS code. Mines intermittent, fine for miles in 5th on the motorway then all of s sudden stops boosting, if I floor it all the time it doesn't do it. It's only low rpm when engine is probably under load. Turn the engine off and on again and it's fine. Would you suggest a new n75 valve or try the Mr muscle job? I've been using loads of fuel additive s and one where you spray it into the induction hose after the maf but still no joy. The vans booked in for a pd130 swap with hybrid turbo but I need s cheap and easy fix until my engine swap has been done. Thanks!
Did you ever get to the bottom of your issue? Sounds a lot like the issue I’m having on my BLS Caddy. I get no fault codes even when it’s in limp mode.
@@Mac_F87 yes mate the n75 valve was blocked/had no pressure. The engine threw a rod in the end but when I was changing it for a bkd 2.0 and the turbo and n75 could've done with being changed
@@jamestyrrell2225 ah right I'll buy a new N75 then. I'll try that before going to the trouble of taking the turbo off and cleaning the VNT etc. I'm concidering doing the con rod bearings and bolts on mine to stop it throwing a rod in the future.
@@jamestyrrell2225 after checking vacuum from the tandem pump, doing and output test on the N75 while connected to my vacuum gauge and doing and output test while everything was connected as normal it turns out it was my VNT actuator that’s faulty. The rod was only moving 5mm or so while doing the output test.
Do u know if audi a6 c7 has this part?
Top name for the van lol
Lol
It's also called the boost control solenoid.
Its a N75 valve in the vag community also known as a moo valve.
German efficiency for you, using numbers instead of names. Lol.
Yeah sounds about right.
It’s this the same for overboost?
Do u know if audi a6 c7 has this?
Is the camera recording 60hz? Our electric is 50hz so maybe that
It sure was and we are. This has been sorted and any new videos I've filmed since dont flicker :)
Did this completely get rid of the P0299 fault?
Yes as this was the fault on the van.
Thanks changed mine done all sorts just won’t stop throwing the underboost code up😢
Hi where can I get a OEM n75 valve please apart from VW dealer
It is possible to get them online just make sure pierburg valve.
@@bluudysgarage thanks for your reply 👍
Anybody knows how to disassembly this kind of n75 ?
Haha i knew it 😀
4.4 benzin
You damaged it with mr cleaner right? Lame problems from corrosive products inside vacuum circuits
Not at all. Fault was there before and after. Not sure how you think the cleaner can get inside the vaccum system.. hahaha
@@bluudysgarage just asking if there is any relation. Thank you
Yeah no problem. No it can't get into the other system from the exhaust.
Bellend
These things are absolutely terrible vehicles, mine costs £4k+ per year in maintenance and can't get 4 months before it lets me down monumentally so bad I have to have a spare vehicle for when I fails. I've wanted to sell it for years but everytime I fix it something else fails. VW are a joke. Do not buy one, actually buy mine its a 2011 it's had almost every single mechanical part replaced Including: engine, gearbox, turbo, intercooler, clutch, clutch bearings X2, all suspension, Egr, dpf, power steering pump, clutch, flywheel, brake calipers, top mounts, drop links, alternator, all wheel bearing hubs twice, discs pads, tons of tyres, water pumps, cambelt, window switches, fan blower resistor, it's non stop I've had 8 drop links in 4.5 years. £12k if anyone wants it, I only do 6-8k per year too!!!!! Always used with shell vmax diesel.