my Volvo XC60 has a P0135 code, what does that mean and how to fix it?

Learn how to diagnose and fix P0135 oxygen sensor heater circuit issue in Volvo XC60. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Remove Oxygen Sensor

• Locate the upstream oxygen sensor (Bank 1) on the exhaust manifold.
• Use an oxygen sensor socket or wrench to carefully unscrew the sensor.
• Disconnect the wiring harness from the oxygen sensor.

3. Inspect and Test

• Visually inspect the oxygen sensor for damage.
• Using a multimeter, test the resistance of the heater circuit in the oxygen sensor. The resistance should match manufacturer specifications (typically around 10-30 ohms).
• If the resistance is out of range, replace the oxygen sensor.

4. Replace Oxygen Sensor

• Apply anti-seize compound to the threads of the new oxygen sensor (if required).
• Install the new oxygen sensor by threading it into place and tightening it to the manufacturer's specified torque (usually around 30-40 ft-lbs).
• Reconnect the wiring harness to the new oxygen sensor.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0135 code from the vehicle's computer.