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Possible Causes

Possible Causes
HIGH RESISTANCE IN THE O2 SENSOR 1/2 HEATER CONTROL CIRCUIT
HIGH RESISTANCE IN THE FUSED ASD RELAY OUTPUT CIRCUIT
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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