how to clear P0135 oxygen sensor code on Volkswagen Golf MK5 (2004-2008)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the vehicle’s battery to avoid electrical shock.

2. Inspect and Replace the Oxygen Sensor

• Tools Required: O2 sensor socket, wrench set, torque wrench, multimeter.
• Sub-steps:
  1. Locate the upstream oxygen sensor (usually near the exhaust manifold).
  2. Disconnect the electrical connector from the oxygen sensor.
  3. Using the O2 sensor socket, unscrew the old oxygen sensor from the exhaust.
  4. Apply anti-seize compound to the threads of the new oxygen sensor (if required).
  5. Install the new oxygen sensor and tighten it to the manufacturer’s specified torque (typically around 30 Nm).
  6. Reconnect the electrical connector securely.

3. Check Wiring and Connectors

• Tools Required: Visual inspection tools, multimeter.
• Sub-steps:
  1. Inspect the wiring harness leading to the oxygen sensor for any signs of wear, fraying, or corrosion.
  2. Use a multimeter to test the resistance of the heater circuit to ensure it is within specifications (usually around 4-10 ohms).
  3. Repair or replace any damaged wiring or connectors as needed.

4. Clear the Trouble Code

• Tools Required: OBD-II scanner.
• Sub-steps:
  1. Reconnect the battery if it was disconnected.
  2. Use the OBD-II scanner to clear the P0135 trouble code from the vehicle’s computer.
  3. Perform a test drive to monitor for the reoccurrence of the code.