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Home >> Dodge and Ram >> 2005 >> Durango 5.7 D, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0121 To P0171 >> Diagnosis And Testing >> P0139-O2 Sensor 1/2 Slow Response >> Possible Causes

Possible Causes

Possible Causes 
EXHAUST LEAK
(K141) O2 1/2 SIGNAL CIRCUIT
(K904) O2 RETURN DOWNSTREAM CIRCUIT
O2 SENSOR

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

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