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Home >> Jeep >> 2006 >> Commander Base, 4.7 N, RWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> 3.7L & 4.7L & 5.7L Engine - DTCS P0016 To P0118, Diagnostic Code Index, Pre-Diagnostic Troubleshooting Procedure & Intermittent Condition >> Electrical Diagnostics >> Diagnosis And Testing >> 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
O2 SENSOR
PCM

Always perform  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE   before proceeding. 

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