I have a friend that needs the Q21-6167-001K1T DEF Sensor part. As you guys said below, no one has it. He's a 1-truck operation, and until PACCAR (or is it KW?) comes out with the software update or gets stock of this part, he's having to contract support for deliveries. These guys need to either release that firmware or tell us how to wire in some resistors or some way to let the truck know it isn't out of DEF. This could absolutely sink/bankrupt small businesses. Right with you on the Way, the Truth, and the Life! Thanks for sharing that encouragement.
Had a truck throw a “DEF Quality Bad” code come up on the dash. Changed the level sensor and did a regen. The regen ran about 45 minutes and all the lights bells and warnings went away. Not sure if this will help anyone but just sharing my experience. Stay safe out there.
Work for Werner. We have like 8-9 trucks waiting on these at my shop. Got em on back order. Mostly KWs but also internationals & one Paccar. Gonna be an interest
I work for a pete dealer. These def combo sensors are the biggest train wreck of the truck industry. It also is going on a the worst possible time with Covid and shortages. The most annoying this is the factory blaming it on the heater control valve which is stupid. The issue is the sensor. Luckily paccar and cummins are going to release a update to keep the unit from going into derate if the sensor fails. This will only be temporary. Once the supply or issue is fixed the software will have to be rolled back.
What’s up brother, I been having an issue with my DEF system as well. I got the DEF doser replaced, the DEF pump replaced, and also a DEF line replaced. When I drive approximately 40 miles I get a increase derate warning and the DEF light comes on. I have a Cummins engine ISX15. Do you have any idea what is causing this?
@@antonioorozco4896 it is a 2017 pete 579 with sleeper, showing fault code 4277. confused what the difference is between the round head with the lines and the little square one (pn is Q21-6170-003k1t)
@@andresenriquez8107 so, if I'm understanding correctly the round one with the lines is the DEF level sensor, it comes on the older models (2016 a below, I believe) the square one is the DEF quality/level sensor those are the ones a lot of trucks are having issues with. You pretty mich have to remove the tank to R&R.
@@antonioorozco4896 i just replaced the quality sensor, no sensor code anymore but still showing same codes 3712 (stop engine) and 3714 (torque de rate). what is the correct procedure after replacing the sensor so the truck can clear those codes? A regen was done with insite and passed/completed but nothing cleared.
My volvo truck has been detecting bad def quality, it has me re-gen every other day. I have taken it to a mechanic and nothing can be found. Do you think it could be the def quality sensor?
Dealers are saying 6-8 weeks for this part. Does anyone know if it's possible to bypass the broken sensor and trick the computer? Is it just a static voltage level that this sends out?
@@f.fernandez6960 Well luckily, the EPA granted a bypass on it through the computer some time ago. Because of the part shortage, things like this were about to cause an economic crisis.
2016 579 Pete, mx13 my def gauge light turned on permanently, the dash reads bad quality def, replace. I use blue def. I changed the def quality sensor. I still have the same problem. The wrench light is on, not the other check engine light. Can you please advice. Thank you.
Recommend getting software connected to the truck to read codes and diag accordingly. Without codes there's no way of knowing and it is all guess work.
@@antonioorozco4896 thank you for answering, I continue to drive it. But I get no codes. Just that reading about poor quality def and the def light on, not blinking, just on.
Update on my 2016 579 pete. The def gauge light popped on and my dash read bad def quality , I changed the sensor and the problem continued, no check engine light, no codes to follow, well today after driving for hours, I heard a ding in my dash, wouldn't you know it, all back to normal!!!😂 so I guess it was the def quality sensor after all. Hope this helps someone. Thank you.
HEY Antonio sorry that happened to you,,, but here is a quick tip going forward only use ( DEF fluid from the jug ) YOU CAN purchase it from Kenworth PETERBILT or the truck stop yeah I know that it is really expensive but it will save you money and time from going to Kenworth and paying thousands for unnecessary repairs.trust me ( DEF FLUID FROM THE JUG ONLY )never ever use the DEF AT THE TRUCK STOP FUEL ISLAND .take care
I get kenworth t680 2019 from kenworth Omaha, after 5000 miles def level sensor fail. I went to kenworth dealer for warranty and they told me only cummins parts have warranty not paccar. Truck is only 450k miles now i have to wait 3 months for def sensor.
@@antonioorozco4896 I may be having the same issue...Going to dealer in the morning..GOT SCR ENGINE FAULT AND DERATE stop engine immediately light..Also flashing red def light..if this turns out to be a def quality sensor on my 2014 t680 paccar..how long of a wait is it normally these days for one..??
@@darrolong1175 DEF quality sensors started coming out in 2016, if I remember correctly. Your 2014 wouldn't have a quality sensor, only DEF level sensor.
@@antonioorozco4896 Thank you.I just found that out myself after talking to parts dept..at dealer...He said that may be good news cause they have the leveling sensor..not sure til they diagnose tommorrow but my truck has all the same lights and warnings as your video above..stop engine immediately..SCR REPAIR.And flashing red def light
@@moonrunnerlife1640 what year model? It sounds like they're using a generic scanner like JPro. Paccar software gives you different trouble codes usually starts with a P or U.
@@antonioorozco4896 it's a 2016. And those are the jpro codes I have. Regardless the codes they pulled at last 3 MHC with davies did not fix. The light only comes on after I let the truck sit for at least 3 days. It will not use any def. Then def will start working again when I unplugged dozer and reset ecm with key clicks.. It is using a full tank of def to a fuel up. Light always comes on around the same level just over half tank. Drop your email ill send you all these things they did that didn't fix it.
I have a friend that needs the Q21-6167-001K1T DEF Sensor part. As you guys said below, no one has it. He's a 1-truck operation, and until PACCAR (or is it KW?) comes out with the software update or gets stock of this part, he's having to contract support for deliveries. These guys need to either release that firmware or tell us how to wire in some resistors or some way to let the truck know it isn't out of DEF. This could absolutely sink/bankrupt small businesses.
Right with you on the Way, the Truth, and the Life! Thanks for sharing that encouragement.
Great word man of God blessings to you and your family
Thank you. God bless you too, my brother.
Good to love your job 😃👍
Yes, sir! Thanks, Dave!
Thanks for sharing
Had a truck throw a “DEF Quality Bad” code come up on the dash. Changed the level sensor and did a regen. The regen ran about 45 minutes and all the lights bells and warnings went away. Not sure if this will help anyone but just sharing my experience. Stay safe out there.
Been having a lot of issue with def sensor at work ( Peterbilt) you can do a quick check of the can line
Work for Werner. We have like 8-9 trucks waiting on these at my shop. Got em on back order. Mostly KWs but also internationals & one Paccar. Gonna be an interest
The backorder is what killing us all. High demand, low/no supply.
Can you take apart and clean mx13 Egr valve ?
Hi. Sorry bay, how much is the heat en def tank when the truck is running. A don’t no if the valve is opened the heater tanks
Good video 👍
Thank you, sir.
I'm a heavy equipment and we have plenty of kw's in our fleet and your videos are very helpful, thank you!
I forgot "mechanic
@@davidslager5189 I appreicate the support, bud!
Amen
Thank you
The gauge reads as it should, but the light is on. It does regen.
I work for a pete dealer. These def combo sensors are the biggest train wreck of the truck industry. It also is going on a the worst possible time with Covid and shortages. The most annoying this is the factory blaming it on the heater control valve which is stupid. The issue is the sensor. Luckily paccar and cummins are going to release a update to keep the unit from going into derate if the sensor fails. This will only be temporary. Once the supply or issue is fixed the software will have to be rolled back.
We've seen a few heater control valves go bad here at our shop.
Are there any def or scr issues after that? If the def gets heated too much the water would evaporate throwing off the def concentration.
@@billy-sx8wx the techs that found bad heater valves replaced the def in the tank. Aftet that, they passed regen and test drive
@@antonioorozco4896 so def quality was discovered to be incorrect?
@@billy-sx8wx according to what the techs told me, they went aheaded and quoted the def replacement to avoid further issues.
What’s up brother, I been having an issue with my DEF system as well. I got the DEF doser replaced, the DEF pump replaced, and also a DEF line replaced. When I drive approximately 40 miles I get a increase derate warning and the DEF light comes on. I have a Cummins engine ISX15. Do you have any idea what is causing this?
Could be a dirty def filter, hopefully not the egr valve. I pressure washed mine about a year ago, worked out fine.
Did you need to drop the DEF tank to replace the quality sensor? (the one with the square top without the lines)
Is it a T680 with a sleeper?
@@antonioorozco4896 it is a 2017 pete 579 with sleeper, showing fault code 4277. confused what the difference is between the round head with the lines and the little square one (pn is Q21-6170-003k1t)
@@andresenriquez8107 so, if I'm understanding correctly the round one with the lines is the DEF level sensor, it comes on the older models (2016 a below, I believe) the square one is the DEF quality/level sensor those are the ones a lot of trucks are having issues with. You pretty mich have to remove the tank to R&R.
@@antonioorozco4896 i just replaced the quality sensor, no sensor code anymore but still showing same codes 3712 (stop engine) and 3714 (torque de rate). what is the correct procedure after replacing the sensor so the truck can clear those codes? A regen was done with insite and passed/completed but nothing cleared.
My volvo truck has been detecting bad def quality, it has me re-gen every other day. I have taken it to a mechanic and nothing can be found. Do you think it could be the def quality sensor?
It's possible. It can be an array of things. Have they checked the actual quality if the DEF?
@@antonioorozco4896 yes they already checked it
Dealers are saying 6-8 weeks for this part. Does anyone know if it's possible to bypass the broken sensor and trick the computer? Is it just a static voltage level that this sends out?
Unfortunately, there's no way to bypass.
did you order the part? if you did take scotch tape and paste on top of the ECU computer this won't fix it but it would let the ECU that you order it.
@@f.fernandez6960 Well luckily, the EPA granted a bypass on it through the computer some time ago. Because of the part shortage, things like this were about to cause an economic crisis.
2016 579 Pete, mx13 my def gauge light turned on permanently, the dash reads bad quality def, replace. I use blue def. I changed the def quality sensor. I still have the same problem. The wrench light is on, not the other check engine light.
Can you please advice.
Thank you.
Recommend getting software connected to the truck to read codes and diag accordingly. Without codes there's no way of knowing and it is all guess work.
@@antonioorozco4896 thank you for answering, I continue to drive it. But I get no codes. Just that reading about poor quality def and the def light on, not blinking, just on.
Update on my 2016 579 pete. The def gauge light popped on and my dash read bad def quality , I changed the sensor and the problem continued, no check engine light, no codes to follow, well today after driving for hours, I heard a ding in my dash, wouldn't you know it, all back to normal!!!😂 so I guess it was the def quality sensor after all. Hope this helps someone.
Thank you.
Awesome!!! Glad to hear your issue has been resolved.
HEY Antonio sorry that happened to you,,, but here is a quick tip going forward only use ( DEF fluid from the jug ) YOU CAN purchase it from Kenworth PETERBILT or the truck stop yeah I know that it is really expensive but it will save you money and time from going to Kenworth and paying thousands for unnecessary repairs.trust me ( DEF FLUID FROM THE JUG ONLY )never ever use the DEF AT THE TRUCK STOP FUEL ISLAND .take care
3 shops couldn't find it.
I get kenworth t680 2019 from kenworth Omaha, after 5000 miles def level sensor fail. I went to kenworth dealer for warranty and they told me only cummins parts have warranty not paccar. Truck is only 450k miles now i have to wait 3 months for def sensor.
Crazy stuff, man. We have trucks there that have been waiting for 2 months, as well.
Having issues with my def system on my International 4300 Navistar box truck
Not too familiar with Navistar. What's going on with it?
@@antonioorozco4896 qls system its fixed now though
@@Fomondale35 thanks for sharing.
Do you have any DEF quality sensors?
Nobody has them. National backorder
@@antonioorozco4896 I may be having the same issue...Going to dealer in the morning..GOT SCR ENGINE FAULT AND DERATE stop engine immediately light..Also flashing red def light..if this turns out to be a def quality sensor on my 2014 t680 paccar..how long of a wait is it normally these days for one..??
@@darrolong1175 DEF quality sensors started coming out in 2016, if I remember correctly. Your 2014 wouldn't have a quality sensor, only DEF level sensor.
@@antonioorozco4896 Thank you.I just found that out myself after talking to parts dept..at dealer...He said that may be good news cause they have the leveling sensor..not sure til they diagnose tommorrow but my truck has all the same lights and warnings as your video above..stop engine immediately..SCR REPAIR.And flashing red def light
@@darrolong1175 glad I could I answer your question. God bless you, my man.
Had this code for 8 months now been to 3 different shops spent 5k. Code still there.. I think this is my problem.
What have they replaced?
It is also known that DEF heater valves can cause DEF quality sensors to go bad.
What codes are you getting?
The ACM, the DEF pump and the Def dozer valve. I have a code SPN 5112 controller #6. What am I looking at. With the 5112 code?
@@moonrunnerlife1640 what year model? It sounds like they're using a generic scanner like JPro. Paccar software gives you different trouble codes usually starts with a P or U.
@@antonioorozco4896 it's a 2016. And those are the jpro codes I have. Regardless the codes they pulled at last 3 MHC with davies did not fix. The light only comes on after I let the truck sit for at least 3 days. It will not use any def. Then def will start working again when I unplugged dozer and reset ecm with key clicks.. It is using a full tank of def to a fuel up. Light always comes on around the same level just over half tank. Drop your email ill send you all these things they did that didn't fix it.
@@antonioorozco4896 I will bring the truck to you but im sure you work from an undisclosed location at a secure compound. Jp.
I need the specs lol
What specs do you need?
@@antonioorozco4896 to test that sensor my job is so cheap they don’t want to get any sort of program to work on this stuff
@@franciscofranco6486 sorry, those would be proprietary to PACCAR.