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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
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

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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