how to fix P0135 code on my BMW X5 F15 (2014-2019)

Solution

1. Preparation

• Gather necessary tools and parts before starting the repair.
• Ensure the vehicle is parked on a level surface with the engine off.
• Disconnect the battery negative terminal to prevent electrical shock.

2. Remove the Oxygen Sensor

• Locate the upstream oxygen sensor on Bank 1 (usually near the exhaust manifold).
• Use an oxygen sensor socket to unscrew the sensor from its mounting location.
• Disconnect the wiring harness from the oxygen sensor.

3. Inspect and Clean

• Inspect the oxygen sensor connector for corrosion or damage; clean if necessary.
• Check the wiring for any signs of wear or short circuits.
• If any damage is found, repair or replace the damaged wiring or connector.

4. Install New Oxygen Sensor

• Apply anti-seize compound on the threads of the new oxygen sensor (if applicable).
• Screw the new oxygen sensor into place and tighten to the manufacturer's specifications (typically around 30 Nm).
• Reconnect the wiring harness securely.

5. Reconnect Battery and Test

• Reconnect the negative battery terminal.
• Start the engine and let it idle for a few minutes.
• Check for any exhaust leaks around the new sensor installation.