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Home >> Jeep >> 2007 >> Commander Overland, 4WD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> DTCS P0016 To P0122, Pre-Diagnostic Troubleshooting Procedure, Intermittent Condition >> P0051-O2 Sensor 2/1 Heater Circuit Low >> Possible Causes
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Possible Causes

Possible Causes 
(K199) O2 2/1 HEATER CONTROL CIRCUIT SHORTED TO GROUND
EXCESSIVE RESISTANCE IN THE (K199) O2 2/1 HEATER CONTROL CIRCUIT
2/1 O2 SENSOR
POWERTRAIN CONTROL MODULE (PCM)

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