Possible causes
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1157 Description
The downstream HO2Ss are forced rich and lean and monitored by the PCM. The test fails if the PCM does not detect the output of the HO2S in a calibrated amount of time.
P1157 Information for specific makes
P1157 BUICK
P1157 CADILLAC
P1157 CHEVROLET
P1157 FORD
P1157 GMC
P1157 HONDA
P1157 ACURA
P1157 CADILLAC
P1157 CHEVROLET
P1157 FORD
P1157 GMC
P1157 HONDA
P1157 ACURA