how to fix the P0135 code in my Volkswagen Golf MK7.5 (2020-Present)?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to prevent any electrical issues.

Tools Required:

• OBD-II scanner
• Multimeter
• Socket set
• Torque wrench
• Wire stripper/crimper (if needed)

2. Inspect and Repair Wiring

• Visual Inspection: Examine the O2 sensor wiring harness for any signs of wear, damage, or disconnection.
• Repair Connections: If any wiring issues are found, repair or replace the damaged sections using wire stripper/crimper.
• Secure Connections: Ensure all connectors are tightly secured.

3. Replace O2 Sensor (if necessary)

• Remove O2 Sensor:
  • Locate the O2 sensor (usually near the exhaust manifold).
  • Use a socket wrench to unscrew the sensor from its position.
• Install New O2 Sensor:
  • Apply anti-seize compound to the threads of the new sensor.
  • Tighten the sensor to manufacturer specifications (typically around 30 ft-lbs).

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals securely.
• Use the OBD-II scanner to clear the P0135 code from the vehicle’s computer.

5. Test Drive

• Start the engine and allow it to reach operating temperature.
• Perform a test drive to ensure the check engine light does not reappear and that the vehicle runs smoothly.