wurger

Another CEL with P1124 and P1126 First off, thanks for all the info and input here on this excellent site! Not long ago I purchased a 1999 Carrara with 44k miles. In preparation for the 45k service, I removed the airbox to check if the car had a K&N filter before purchasing the filters for the service. I put the car back together and the next time I drove the car the CEL light came on after about 5 min of driving. The idle seemed to be a bit inconsistent (600-1200 rpm) when letting off the gas at a stop also. So after searching through RennTech and the PCA site for info. I performed the following checks: 1) I performed the 45k service, replaced the pollen and air filters, oil, oil filter etc. 2) Used the Durumetric cable to check for fault codes and found: P1124 Oxygen Sensing Adaptation Area 1 (Cylinders 1 - 3) - Rich Threshold P1126 Oxygen Sensing Adaptation Area 1 (Cylinders 4 - 6) Rich Threshold SO, I did all the things people mention for P1124 and P1126... Cleaned the MAF with CRC elec cleaner. Cleaned the throttle body and Idle Control Valve (ICV) with carb cleaner (this helped smooth the idle out). Checked the Air Oil Separator (AOS) for leaks, none found. Checked coils for condition/cracks, none found. Replaced o-ring in the oil cap. Checked the fuel cap. Ran a bottle of techron fuel sys cleaner through. I also checked for vacuum leaks but the CEL keeps coming back after 5-30min of driving. So, I still think there is an air leak but Ive yet to find it. Maybe the oil filler tube? Any suggestions on what method to use for finding an air leak? Ive heard mention of a smoke test but dont have the equipment. Any other thoughts would be appreciated. Thanks in advance.