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Home >> Fiat >> 2014 >> 500L Easy, Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> 1.4L - DTCS P0016-00 To P0335-00 - 500L >> Diagnosis And Testing >> P0140-00-O2 Sensor 1/2 No Activity Detected >> Possible Causes
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Possible Causes

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

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  STANDARD PROCEDURE  .