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Possible Causes

Possible Causes
O2 SENSOR 2/2 HEATER CONTROL CIRCUIT SHORTED TO VOLTAGE
O2 SENSOR 2/2 HEATER CONTROL CIRCUIT SHORTED TO GROUND
O2 SENSOR 2/2 HEATER CONTROL CIRCUIT OPEN/HIGH RESISTANCE
O2 SENSOR 2/2 HEATER GROUND CIRCUIT OPEN/HIGH RESISTANCE
O2 SENSOR 2/2 SIGNAL CIRCUIT SHORTED TO VOLTAGE
O2 SENSOR 2/2 SIGNAL CIRCUIT OPEN/HIGH RESISTANCE
O2 SENSOR 2/2 RETURN CIRCUIT OPEN/HIGH RESISTANCE
O2 SENSOR 2/2
POWERTRAIN CONTROL MODULE (PCM)

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  . 

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