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Home >> Lexus >> 2002 >> ES 300 >> Repair and Diagnosis >> External Pages >> Different car >> Section 518 (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
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Possible Causes

WARNING: This page is about a different car, the 2004 Chrysler Pacifica. However, it is still accessible from the selected car via links, so may be relevant.
  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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