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Home › Chrysler › 2004 › Pacifica AWD › Repair and Diagnosis › Engine Performance › System › Powertrain Diagnostic Procedures › Diagnostic Procedures › DRIVEABILITY - NGC - Diagnostic Tests › P0031-O2 Sensor 1/1 Heater Circuit Low, P0037-O2 Sensor 1/2 Heater Circuit Low › Possible Causes

Possible Causes

  1. O2 SENSOR HEATER OPERATION
  2. O2 HEATER ELEMENT
  3. O2 HEATER CONTROL CIRCUIT
  4. O2 HEATER CONTROL SHORTED TO GROUND
  5. PCM
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