how to fix P0135 oxygen sensor issue in Volkswagen Golf Eighth Generation (2020-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety.
• Allow the engine to cool if it has been running.

2. Remove Faulty Oxygen Sensor

• Locate the upstream oxygen sensor on the exhaust manifold.
• Use a socket wrench (typically a 22mm oxygen sensor socket) to unscrew and remove the sensor.
• Carefully disconnect the electrical connector from the sensor.

3. Inspect and Clean

• Inspect the wiring harness and connector for damage or corrosion.
• If the wiring appears intact, clean the connector pins with electrical contact cleaner to ensure a good connection.

4. Install New Oxygen Sensor

• Install the new oxygen sensor by threading it into the exhaust manifold.
• Tighten the sensor to the manufacturer’s recommended torque specification (usually around 30 Nm).
• Reconnect the electrical connector to the new oxygen sensor.

5. Reconnect Battery and Clear Codes

• Reconnect the negative terminal of the battery.
• Use the OBD-II scanner to clear the P0135 code from the vehicle’s memory.

6. Test Drive

• Drive the vehicle for a short distance to allow the engine to reach operating temperature and monitor for any reoccurring codes.