Car has been throwing lean codes recently, sometimes bank 1 and sometimes bank 2. Then it went to lean on both banks another day . The other day it threw codes 0171,0174,0172,1075, both banks lean and both banks rich. Yesterday it threw 0171,0174,0172, banks 1 and 2 lean and bank 1 rich. The car is 04 auto,37000 miles needswings intake, eurocharged tune. It has a new battery. I have adjusted the intake several times to check for leaks,put on a new maf (bosch) . Checked fuel door for a good seal,checked oil filer canister for a good seal , check oil filler cap for a good seal. I am going to load the stock tune back onto the ecm to see if that makes a difference. Seems like if it was a o2 sensor it would need to be on both sides which seems unlikely to go out at the same time. Any ideas before I load the stock tune back onto the ecm.

Thanks,

 

Anyone have a guess.

 

Ideas anyone?

 

Sounds like a vacuum leak more than likely. I would start there first since new lines are only $2 a foot.

 

Is there a diagram somewhere to show all the engine vacuum lines?

 

Still having same codes (bank 1 and 2 rich and lean). When I read the codes with my eurocharged software it show at the top of the screen evap in red, all the rest like o2 sensor,cat, etc are green. Can I assume it is related to the evap syestem?