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P0157 P0158 P0161 P1157 Fault Codes on 1997 Chevrolet Suburban 1500 5.7L V8 - O2 Sensor Issues

Model: 1997 Suburban 1500 5.7L Fault Code: P0157 Posted: 2016-07-20 17:41

The vehicle's OBD-II scanner is displaying four fault codes: P0157, P0158, P0161, and P1157, all detected with the key on and engine off. The Malfunction Indicator Lamp (MIL) has remained illuminated for over 400 miles during recent trips. I'm confused about how an oxygen sensor can simultaneously register both high and low readings—this seems contradictory. Could this indicate a faulty sensor or a wiring issue? Any insights into diagnosing these codes on a 1997 Chevrolet Suburban 1500 with a 5.7L V8 engine?

Related fault codes
P0157P0158P0161P1157
Comments (3)
Anonymous 2016-07-22 13:40

The P0157 and P0158 codes suggest a potential fault in the B2S2 oxygen sensor, which is likely the primary cause of these readings.

Anonymous 2016-07-27 20:58

Additionally, the presence of code P1157 indicates that the second oxygen sensor (B2) has no feedback signal to the engine control module, affecting fuel trim. This may point to a wiring issue or sensor failure—could there be an underlying problem with the B2 sensor circuit?

Anonymous 2016-07-27 20:59

*The symptoms don't quite align with expected behavior; it's unclear whether this is due to a hardware fault, electrical interference, or a misdiagnosis in the OBD-II system.*