I drive an 01 TT Roadster yesterday on the way home my check engine light turn on...so i went to AutoZone to check out the problem (damn they charge for using the OBD reader) after that I checkto see whatswrong with it..then it the code pop up P1128..Car isrunning lean andsomething air fuel...So I went back andreturn the OBD reader and ask them what could cause the problem ..
1.O2 Senor
2. Air Leak
I check all my horse and check and tighten all my intake screws and crimps
Had anyone had this problem before: if do how did you guys fix it..
by the way I only had few mod on the car like intake and BOV from Forge (forge Splitter)

 

Try cleaning your MAF first. It's either bad or dirty. Pick up a can of CRC MAF cleaner at AutoZone and remove the MAF. It's the black tube with a electrical connector hooked to the tube leading out of the air filter. Spray everything down really good, let it dry and reinstall.

 

hmm...okay I'll try that thanks man