Thread: MAF problems?

Have an 04 impala ss. The car was studdering really bad and die out in the middle of driving. i replaced the MAF sensor and pigtail. She ran like a champ. Few days later she starting doing this all over again. When i took the connector off the MAF sensor it would not do anything to the engine again like before i replaced it new. I will try the O2 sensor, vacuum leaks, and exhaust leaks from the other threads but is there anything else? She finally threw a code, im on the way to autozone. Thanks

P0420, p0121, p0101

Originally Posted by krysp432

P0420, p0121, p0101

five seconds in google, dude.

P0420 Error Code: Catalyst System Efficiency Below Threshold (Bank 1)
OBD-II Trouble Code: P0121 Throttle Position Sensor/Switch A Circuit Range/Performance Problem
P0101 Trouble Code - Mass Air Flow (MAF) Circuit Range/Performance Problem

Yes the Google machine is quite outstanding. Just cant understand how and why she would pull all these codes instantly. From running grand to running poorly with codes.

Just replaced a few vacuum hoses and the vac manifold on top of s/c. Now she is running grand with no codes. What gives? Surely the little I replaced may fixed 1 of 3 codes but to fix all three? Thanks