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Possible Causes

Possible Causes
(K99) O2 SENSOR 1/1 HEATER CONTROL CIRCUIT OPEN
O2 SENSOR 1/1 HEATER GROUND CIRCUIT OPEN
O2 SENSOR 1/1
POWERTRAIN CONTROL MODULE (PCM)

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

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