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Home >> Chrysler >> 2006 >> PT Cruiser Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> 2.4L Engine - DTCS P0128 To P0325 >> Diagnosis And Testing >> P0131-O2 Sensor 1/1 Circuit Low >> Possible Causes

Possible Causes

Possible Causes 
(K902) O2 RETURN UPSTREAM CIRCUIT SHORTED TO GROUND
(K41) O2 1/1 SIGNAL CIRCUIT SHORTED TO GROUND
(K41) O2 1/1 SIGNAL CIRCUIT SHORTED TO (K902) O2 RETURN UPSTREAM CIRCUIT
(K41) O2 1/1 SIGNAL SHORTED TO THE (Z902) O2 1/1 HEATER GROUND CIRCUIT
O2 SENSOR
PCM

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

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