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Home >> Jeep >> 2005 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 547 (DTCS P0121 To P0171) >> Diagnosis And Testing >> P0139-O2 Sensor 1/2 Slow Response >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes 
EXHAUST LEAK
(K141) O2 1/2 SIGNAL CIRCUIT
(K904) O2 RETURN DOWNSTREAM CIRCUIT
O2 SENSOR

Always perform  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  before proceeding. 

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