Oxygen sensor before cat heater circuit low. Is car acting up in any way? Usually check wiring and if good replace sensor.
October, 21, 2011 AT 4:59 AM
A P0051 DTC trouble code may be caused by one or more of the following: A short in the heater circuit in the sensor A failed O2 sensor heater Wiring/connectors broken/frayed leading to sensor and/or relay Failed PCM/ECM