Test Step 4 - (Z902) O2 SENSOR 1/1 HEATER GROUND CIRCUIT OPEN

Fig 1: Measuring Resistance Between Ground And (Z903) O2 1/2 Heater Ground Circuit In O2 Sensor Harness Connector

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

• Measure the resistance between ground and the (Z902) O2 Sensor 1/1 Heater ground circuit in the O2 Sensor harness connector.

Is the resistance below 0.5 Ohm?

Yes 

• Go to Test Step 5 - POWERTRAIN CONTROL MODULE (PCM) 

No 

• Repair the excessive resistance in the (Z902) O2 Sensor 1/1 Heater ground circuit.
• Perform the Powertrain Verification Test. Refer to PCM Verification Test (2009 - 2011) & PCM Verification Test (2012 & Up) .