Symptoms of P0042 OBD II Trouble Code
Symptoms of a P0042 DTC includes MIL (Malfunction indicator lamp) illumination. You will probably not notice anyother symptoms associated with the failure of the heated circuit since it only runs momentarily when the vehicle is first started. This sensor is also after the catalytic converter, so it will not affect the air/fuel ratio input to the PCM/ECM; it is primarily used to verify the catalytic converters efficiency.
Common Causes of P0042 OBD II Trouble Code
- Open circuit inside oxygen sensor or open power or ground wires to bank 1, #3 oxygen sensor
- Exhaust system ground strap may have become corroded or broken
- PCM/ECM or oxygen sensor heater circuit wiring has failed