how to fix the P0135 code in my Volkswagen Golf MK7 (2015-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.
• Allow the engine to cool down before working on the exhaust system.

2. Remove the Oxygen Sensor

• Locate the oxygen sensor (Bank 1, Sensor 1) on the exhaust manifold.
• Using a wrench or oxygen sensor socket, carefully unscrew the sensor from the exhaust.
• Disconnect the electrical connector from the oxygen sensor.

3. Inspect and Clean

• Inspect the oxygen sensor for any signs of damage, such as burnt or frayed wires.
• Clean the threads of the oxygen sensor port on the exhaust manifold to remove any carbon buildup.

4. Install New Oxygen Sensor

• Apply anti-seize compound (if necessary) on the threads of the new oxygen sensor.
• Install the new oxygen sensor, ensuring it is threaded in straight.
• Connect the electrical connector firmly to the new sensor.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0135 code from the vehicle's computer.

6. Test the Repair

• Start the engine and let it reach operating temperature.
• Monitor the operation of the new oxygen sensor with the scanner to ensure it is functioning correctly.