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Home >> Jeep >> 2012 >> Grand Cherokee SRT-8 >> Repair and Diagnosis >> Engine Performance >> System >> 6.4L - DTCS P000B To P0197 >> Diagnosis And Testing >> P0051-O2 Sensor 2/1 Heater Circuit Low >> Possible Causes

Possible Causes

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

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

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