hello i changed both cat conv and all four sencers .engine light still came on then i replaced the sencer again in the rear on the driver side check engine light went out for about two weeks and now the engine light is on again the code is po157 i drive a chevey avalanche 2002 1500 5.3 engine can you help strong text
36.2k questions
32.2k answers
1.3k comments
22.8k users