how to fix P0135 oxygen sensor code in Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery to ensure safety while working on electrical components.
• Allow the engine to cool before beginning work.

2. Remove the Oxygen Sensor

• Tools Required: Oxygen sensor socket, ratchet, and extension.
• Locate the oxygen sensor (typically found in the exhaust manifold or downpipe).
• Use the oxygen sensor socket to unscrew and remove the faulty oxygen sensor from its mounting.

3. Inspect and Clean

• Inspect the oxygen sensor connector for any signs of corrosion or damage.
• Clean the connector with electrical contact cleaner if necessary.

4. Install New Oxygen Sensor

• Parts Required: New oxygen sensor (ensure it’s compatible with MK7.5 Golf).
• Apply anti-seize compound to the threads of the new oxygen sensor (if not pre-applied).
• Install the new oxygen sensor by threading it into the exhaust system and tightening it to the manufacturer's specification (typically around 30 Nm).

5. Reconnect Wiring and Battery

• Reconnect the oxygen sensor wiring harness securely.
• Reconnect the vehicle’s battery terminals.

6. Clear Error Codes

• Use the OBD-II scanner to clear the P0135 error code from the vehicle’s computer.