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Home >> Jeep >> 2005 >> Grand Cherokee Limited, 5.7 2 >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0121 To P0171 >> Diagnosis And Testing >> P0139-O2 Sensor 1/2 Slow Response >> Possible Causes
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Possible Causes

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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