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Possible Causes

Possible Causes 
EXHAUST LEAK
(K243) O2 SENSOR 2/2 SIGNAL CIRCUIT
(K904) O2 SENSOR 2/2 RETURN CIRCUIT
O2 SENSOR 2/2

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  . 

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