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Home >> Chrysler >> 2008 >> PT Cruiser Limited, 2.4 E >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0128 To P0335 >> 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
(K902) O2 DOWNSTREAM RETURN CIRCUIT
O2 SENSOR

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.