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Home >> Jeep >> 2009 >> Commander Overland, 4WD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> DTCS P0125 To P0196 - NGC >> P0135-O2 Sensor 1/1 Heater Performance >> Possible Causes

Possible Causes

Possible Causes 
(K99) O2 1/1 HEATER CONTROL CIRCUIT OPEN
(Z42) O2 1/1 HEATER GROUND CIRCUIT OPEN
1/1 O2 SENSOR
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See  DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure  . 

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