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Home >> Chrysler >> 2006 >> PT Cruiser Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 1.6L Engine - DTCS B2277 To P0131, Diagnostic Code Index, Pre-Diagnostic Troubleshooting Procedure & Intermittent Condition >> Diagnosis And Testing >> P0031-1/1 O2 Sensor Heater Circuit Low >> Possible Causes

Possible Causes

Possible Causes 
O2 HEATER ELEMENT
(K99) O2 SENSOR HEATER CONTROL CIRCUIT SHORT TO GROUND
(A142) ASD RELAY OUTPUT CIRCUIT OPEN
PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.  (Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE)  .  

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