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Possible Causes

Possible Causes
(F344) FUSED ASD RELAY OUTPUT CIRCUIT OPEN
(K79) O2 SENSOR HEATER CONTROL CIRCUIT OPEN
(K41) O2 SENSOR SIGNAL CIRCUIT OPEN
O2 SENSOR
POWERTRAIN CONTROL MODULE (PCM)

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

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