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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 >> P0137-O2 Sensor 1/2 Circuit Low >> Possible Causes

Possible Causes

Possible Causes 
(K902) O2 DOWNSTREAM RETURN CIRCUIT SHORTED TO GROUND
(K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO GROUND
(K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO (K902) O2 DOWNSTREAM RETURN CIRCUIT
(K141) O2 1/2 SIGNAL SHORTED TO THE (Z902) O2 1/2 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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