how to resolve the P0135 code in my Volkswagen Golf Seventh Generation (2013-2020)

Solution

1. Preparation

• Gather tools and materials: OBD-II scanner, multimeter, socket set, replacement O2 sensor (if necessary), and electrical cleaner.
• Ensure the vehicle is parked on a flat surface with the engine turned off and cool.

2. Inspect the O2 Sensor

• Step 1: Disconnect the battery to prevent any electrical shorts.
• Step 2: Locate the upstream O2 sensor on the exhaust manifold or exhaust pipe.
• Step 3: Disconnect the electrical connector from the O2 sensor.
• Step 4: Clean the connector and surrounding area with electrical cleaner to remove any corrosion.

3. Test the O2 Sensor Heater Circuit

• Step 1: Use a multimeter to check the resistance of the O2 sensor heater circuit. Refer to the manufacturer's specifications for acceptable resistance values (typically around 10-20 ohms).
• Step 2: If the resistance is outside of the specified range, proceed to replace the O2 sensor.

4. Replace the O2 Sensor (if necessary)

• Step 1: Use a socket set to remove the O2 sensor from the exhaust system.
• Step 2: Install the new O2 sensor and tighten to the manufacturer’s torque specification (usually around 30-40 Nm).
• Step 3: Reconnect the electrical connector securely.

5. Reassemble and Test

• Step 1: Reconnect the battery.
• Step 2: Start the engine and allow it to reach operating temperature.
• Step 3: Use the OBD-II scanner to clear the P0135 code and monitor for any reoccurrence after a test drive.