Test Step 4 - O2 SENSOR 1/2

Fig 1: Identifying O2 Sensor Harness Connector

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

• Turn the ignition off.
• Reconnect the PCM C2 harness connectors.
• Ignition on, engine not running.
• With the scan tool, monitor the O2 Sensor 1/2 voltage.
• Connect a jumper wire between the (K141) O2 Sensor 1/2 Signal circuit and the (K904) O2 Sensor 1/2 Return circuit in the O2 Sensor 1/2 harness connector.

Is the voltage between 2.3 and 2.7 Volts with the jumper wire installed?

Yes 

• Verify that there is good pin to terminal contact in the O2 Sensor 1/2 and Powertrain Control Module connectors. If OK, replace the 1/2 O2 Sensor. Refer to Removal and Installation .
• Perform the Powertrain Verification Test. Refer to PCM Verification Test (2009 - 2011) & PCM Verification Test (2012 & Up) .

No 

• Go to Test Step 5 - (K141) O2 SENSOR 1/2 SIGNAL CIRCUIT OPEN