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Home >> Jeep >> 2008 >> Wrangler Unlimited X, RWD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0128 To P0202 >> P0139-O2 Sensor 1/2 Slow Response >> Possible Causes
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Possible Causes

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

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

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