what does code P0135 mean for Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to prevent electrical shock.

2. Inspect and Repair Wiring/Connectors

• Sub-steps:
  • Remove any protective coverings to access the wiring harness.
  • Inspect for frayed wires or corrosion at the connectors.
  • Repair any damaged wires by splicing in new wire sections or replacing connectors as necessary.

3. Replace Oxygen Sensor

• Sub-steps:
  • Locate the upstream oxygen sensor (Bank 1, Sensor 1), usually found in the exhaust manifold or upstream of the catalytic converter.
  • Use an oxygen sensor socket to carefully unscrew and remove the old sensor.
  • Apply anti-seize compound to the threads of the new sensor to prevent future seizing.
  • Install the new sensor and torque it to the manufacturer’s specifications (usually around 30-40 Nm).

4. Reconnect Battery and Clear Codes

• Sub-steps:
  • Reconnect the vehicle battery.
  • Use the OBD-II scanner to clear the P0135 trouble code from the vehicle's computer.

5. Test the Vehicle

• Sub-steps:
  • Start the engine and allow it to reach operating temperature.
  • Monitor the engine for any signs of rough idling or stalling.
  • Take the vehicle for a test drive to ensure proper operation and check for the reappearance of the check engine light.