Test Step 2 - (K41) O2 SENSOR 1/1 SIGNAL CIRCUIT

• Turn the ignition off.
• Disconnect the O2 Sensor 1/1 harness connector.
• Ignition on, engine not running.
• With the scan tool, monitor the O2 Sensor 1/1 voltage.

Is the O2 Sensor 1/1 voltage between 4.1 and 5.0 Volts?

Yes 

• Go to Test Step 3 - O2 SENSOR 1/1 

No 

• Go to Test Step 5 - (K41) O2 SENSOR 1/1 SIGNAL CIRCUIT SHORTED TO GROUND