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Discussion Starter · #1 ·
Got this code (P11DB) on my 2017 GMC Canyon 2.8 Diesel, took it to a GMC dealership they said that it was the K&N filter causing the code, I for one don't believe that the filter is the problem, I had it in the truck for 21000 miles and I just got the code.
 

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Got this code (P11DB) on my 2017 GMC Canyon 2.8 Diesel, took it to a GMC dealership they said that it was the K&N filter causing the code, I for one don't believe that the filter is the problem, I had it in the truck for 21000 miles and I just got the code.
I have herd of this before.
Did you clean and re oil the filter lately?
Rumor has it that the oil used on K&N filters messes up the sensor in the intake track .
I can’t remember what it is called... getting old . Mass air flow.... wow this is getting spook...
You can pick up a can of sensor cleaner and spray it. Then you shouldn’t have any more issues.
Dont use the K&N any more.
My Ford Ranger didn’t like the K&N ether.......
update.....
P11DB is NOX sensor. That would have nothing to do with a K&N filter.......
So typical dealer BS..
 

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Discussion Starter · #3 ·
I have herd of this before.
Did you clean and re oil the filter lately?
Rumor has it that the oil used on K&N filters messes up the sensor in the intake track .
I can’t remember what it is called... getting old . Mass air flow.... wow this is getting spook...
You can pick up a can of sensor cleaner and spray it. Then you shouldn’t have any more issues.
Dont use the K&N any more.
My Ford Ranger didn’t like the K&N ether.......
update.....
P11DB is NOX sensor. That would have nothing to do with a K&N filter.......
So typical dealer BS..
Thanks that's what I thought BS
 

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I have herd of this before.
Did you clean and re oil the filter lately?
Rumor has it that the oil used on K&N filters messes up the sensor in the intake track .
I can’t remember what it is called... getting old . Mass air flow.... wow this is getting spook...
You can pick up a can of sensor cleaner and spray it. Then you shouldn’t have any more issues.
Dont use the K&N any more.
My Ford Ranger didn’t like the K&N ether.......
update.....
P11DB is NOX sensor. That would have nothing to do with a K&N filter.......
So typical dealer BS..
shame the trucks are ruined by all the sensors. Luckily i am in brasil there is no vehicle inspection or emissions here. I have a 2021 Chevy S10 high country 2.8 duramax.. No DEF fluid system here but it does have EGR and DPF. Can delete all that crap and do a stage 2 ecu reflash which tunes the injectors timing , rail pressure etc and auto transmission. 240 hp and 440 fp torque. Add in an updated downpipe and eliminate the cat is even better. I also have a 2012 Ford \ranger with a 3.0 liter international powerstroke waste gate turbo diesel. 100% deleted from the factory. No EGR, NO DPF, Not even a Cat. 3 inch factory exhaust with an air filter larger than a gallon jug. . I had it reflashed and upgraded the front mount intercooler, eliminated the clutch fan upgraded to full electric fan. The boost spools up so fast now its undergeared.. 230HP and 400 fp torque 5 speed manual. Its like driving a muscle car. Powerbands like an old 2 stroke dirt bike. A blast to rip on it. Best part hammering it 25 pounds boost i still get 28 mpg. Free breathing diesel engines are very efficient
 

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Got this code (P11DB) on my 2017 GMC Canyon 2.8 Diesel, took it to a GMC dealership they said that it was the K&N filter causing the code, I for one don't believe that the filter is the problem, I had it in the truck for 21000 miles and I just got the code.
I run k&n no codes
 

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Got this code (P11DB) on my 2017 GMC Canyon 2.8 Diesel, took it to a GMC dealership they said that it was the K&N filter causing the code, I for one don't believe that the filter is the problem, I had it in the truck for 21000 miles and I just got the code.
My 2019 2.8 didn’t like the K&N neither. Lasted 15,000 miles. New oem filter and no codes plus a little bit better performance.
 

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I went through the same thing with my 2017 Canyon a couple years ago. Put a K&N filter on because why not, its supposed to be quality products and the K&N website swears up and down their filters don't damage MAF sensors. Well they do. Got around 15k miles with it before CIL started popping up. I even opened a claim with K&N and had a personal service rep who was supposed to "go to bat" for me with my warranty claim at the stealership as I was still under the impression that I was right, dealership was wrong or misdiagnosed my truck as it was still under warranty.

I lost a lot of respect for K&N after that experience as it become obvious they'll say anything to get the sale and keep customers buying filters. They never talked to the dealership about my case, and wouldn't contact me or return calls after the initial conversation. They said something like "don't worry, this happens all the time, the dealerships have no idea what their talking about, we have all this data, and bla bla we'll sort this out." Replaced the MAF sensor and back to OEM filter about 50k miles ago and haven't seen another CIL sense.

But don't take my word for it. Open a claim with K&N and see what they tell you. Also there is overwhelming anecdotal evidence on forums like these, that oil bath filters (like K&N) will absolutely interfere or damage modern MAF sensors. To be honest if K&N were a decent company, they wouldn't even sell filters for vehicles with modern MAF sensors, but hey there's a sucker born every minute.
 
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