purchased the k&n intake for my cobalt and installed it and got a cel. the famous system too lean code. so i took the intake off and put the stock one on. then after a few weeks i went to autozone and bought a filter that wasnt oiled and put the intake back on and havent got a cel yet. its been on for three days now

 

its coming. hasnt had time yet

 

i think it would of came on by now it came on the same day i put the intake on last time

 

Mine didnt come on till over a week after i installed it. Hope that works thought i may just have to try that. But i have a feeling it will be back.

 

I've had the CEL P0171 since september when I did the air box modd with a DRY flow filter and since yesterday I installed the Injen intake and my CEL has been out the longest since I've had the car. The design of the Injen intake places the MAF sensor further up the intake piping and the piping is slightly smaller then stock allowing the the MAF to register the increased\faster flowing air drawn in. I think the stock placement of the MAF was ok with the stock filter and box because it was setup to flow at that amout and once you open it up it caused an unmetered air flow. Since the MAF was not reading all the air entering it caused a LEAN condition in were the oxygen sensor senses the lean mixture and then the PCM dumps more fuel into the mixture.