how to fix a P0135 code in my Volkswagen Golf Seventh Generation (2013-2020)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Repair Wiring

• Sub-steps:
  • Remove any protective covers to access the upstream oxygen sensor wiring.
  • Visually inspect the wiring for frays, shorts, or corrosion.
  • If damage is found, repair the wiring using soldering techniques or appropriate connectors.
• Tools Required: Wire strippers, soldering kit, electrical tape.

3. Replace Oxygen Sensor (if necessary)

• Sub-steps:
  • Locate the upstream oxygen sensor (usually found before the catalytic converter).
  • Disconnect the wiring harness from the sensor.
  • Use an oxygen sensor socket to remove the old sensor.
  • Apply anti-seize compound to the threads of the new oxygen sensor.
  • Install the new sensor, tightening it to the manufacturer's specifications (commonly 30 lb-ft).
  • Reconnect the wiring harness securely.
• Tools Required: Oxygen sensor socket, torque wrench, anti-seize compound.

4. Check and Replace Fuse (if necessary)

• Sub-steps:
  • Locate the fuse box and identify the fuse related to the oxygen sensor heater circuit.
  • Remove the fuse and check for continuity using a multimeter.
  • Replace the fuse with a new one if it is blown.
• Tools Required: Fuse puller or pliers, multimeter.

5. Reconnect Battery and Clear Codes

• Sub-steps:
  • Reconnect the negative battery terminal.
  • Use the OBD-II scanner to clear the P0135 code from the computer.
• Tools Required: OBD-II scanner.