how to fix P0135 code in Volvo XC60 First Generation (2008-2017)

Learn how to diagnose and fix P0135 oxygen sensor issues in Volvo XC60 First Generation. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts for the repair.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Allow the engine to cool down if it has been running.

2. Remove the Oxygen Sensor

• Locate the upstream oxygen sensor (usually near the exhaust manifold).
• Use an oxygen sensor socket or a wrench to carefully unscrew the sensor from the exhaust pipe.
• Disconnect the electrical connector from the sensor by pressing the tab and pulling it apart.

3. Inspect and Repair

• Wiring Inspection: Check the wiring harness for any signs of wear, fraying, or corrosion. Repair or replace any damaged wires.
• Connector Check: Ensure the electrical connector is clean and free of corrosion. Use electrical contact cleaner if necessary.
• Heater Circuit Testing: If the wiring and connector are in good condition, use a multimeter to test the heater circuit’s resistance. If it’s out of specification, replace the oxygen sensor.

4. Install New Oxygen Sensor

• Apply anti-seize compound to the threads of the new oxygen sensor (if not pre-applied).
• Screw in the new oxygen sensor by hand to prevent cross-threading, then tighten it securely with a wrench to the manufacturer’s specified torque (typically around 30-35 Nm).
• Reconnect the electrical connector until it clicks into place.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear any existing codes from the engine control module.