Hey guys i have tried every thing on this one. Every week my CEL comes on for the same thing. The code is P0172 System to rich (bank 1).. i have cleaned MAF, Cleaned Throttle Body, Fuel injector Cleaner,New plugs. I took it to the dealer and they were blaming it on my intake but i had the intake on for over a year now and it has never thrown a code before. any idea's..

 

when was the last time you cleaned the filter?

 

2-3 weeks ago when i cleaned my throttle body and MAF.

 

Maybe too much oil on the filter?

 

Dealer sounds like a real tard. The intake should be makign it lean if anything. Take it to another dealer and have them check it out.

 

thats the only chevy dealer in the area the next one is like 40 miles away and i dont have the time for that..

 

Wounder if a clogged cat would cause this? Its a suggestion! I dont know what else it could be!

 

I got this code during the colder days of winter, right after I installed my K&N filter. However, now that its warm, I haven't gotten the code. Seems like its ass backwards but...I have read that it is related to the MAF sensor and air filter (usually oiled filters). Try an AEM Dryflo?

 

put the stock intake back on for a couple days and see what happens? Its a bitch to do, but if it will help you diagnose your problem....

 

fuel injector cleaner/any fuel additive will often set this code. ur intake would just cause a lean condition unless uber clogged. check for a injector leak also. i used some lucas fuel system treatment in my car and set this code..burned all the gas out re fulled and never had it again. on mitchell (automotive troubleshooting technical data thing) it says main cause is fuel additives for this car.