oxygen sensor before cat heater circuit low. is car acting up in any way? usually check wiring and if good replace sensor.
Oct 21, 2011 at 12:31 AM
RASMATAZ
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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