Both codes are showing up and I'm not sure what first step I should take to fixing the problem. When I bought the car it had a unknown aftermarket intake and just the p0171 code came up so after doing research I bought a stock intake then went away now check engine light came back on throwing both codes. Im either going to by the PCM from zzz performance or just get it flashed by Chevy to see if it fixes the problem. By the way it's a 06 s/c with 56,000 miles. If anyone has any advise it would be a lot of help

 

What's the name of the code?

 

System Too Lean P0171 bank 1
System Too Lean P0174 bank 2

should not be getting bank 2 as it is not a V engine. did the old intake have a oil type filter? could be a dirty MAF?

Dave

 

No it had a spectre filter and I cleaned the maf sensor when the light first came on and it went off then came back on. I think I'm going to go with the PCM flash from Chevy to see if that helps

 

As anyone else updated their PCM and it fixed the lean problem?