how to fix P0135 code on Volkswagen Golf Seventh Generation (2013-2020)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Clean Connections

• Remove the plastic cover (if applicable) to access the oxygen sensor wiring.
• Carefully disconnect the connector from the oxygen sensor.
• Inspect the connector for corrosion and clean with electrical contact cleaner if necessary.

3. Replace Oxygen Sensor

• Locate the upstream oxygen sensor (Bank 1 Sensor 1) on the exhaust manifold.
• Using an oxygen sensor socket, carefully unscrew the old sensor.
• Apply anti-seize compound to the threads of the new oxygen sensor to prevent seizing.
• Install the new oxygen sensor and tighten it to the manufacturer's specifications (usually around 30 Nm).
• Reconnect the electrical connector ensuring it clicks into place.

4. Check Fuse and Wiring

• Locate the fuse box and check the fuse related to the oxygen sensor heater circuit, replacing it if blown.
• Inspect the wiring harness for any signs of wear, damage, or short circuits, repairing as necessary.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0135 code from the ECM.
• Start the engine and let it idle for a few minutes to ensure the sensor heats up.