how to fix the P0135 code in my BMW X5 F15 (2014-2019)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to ensure safety.

2. Inspect and Repair Wiring

• Sub-steps:
  • Remove the engine cover if applicable.
  • Trace the wiring harness from the oxygen sensor to the vehicle’s main harness.
  • Repair any frayed or damaged wires using electrical tape or heat-shrink tubing.
  • Check and clean any corroded connectors, ensuring a snug fit.

3. Replace the Oxygen Sensor

• Tools Required: Oxygen sensor socket, wrench set, torque wrench.
• Sub-steps:
  • Locate the upstream oxygen sensor (typically near the exhaust manifold).
  • Disconnect the electrical connector from the oxygen sensor.
  • Use the oxygen sensor socket to unscrew the old sensor from the exhaust system.
  • Apply anti-seize compound to the threads of the new oxygen sensor (avoid getting any on the sensor tip).
  • Install the new oxygen sensor and torque it to the manufacturer’s specifications (usually around 30-35 ft-lbs).
  • Reattach the electrical connector securely.

4. Reconnect Battery and Clear Codes

• Sub-steps:
  • Reconnect the battery terminals.
  • Use the OBD-II scanner to clear the P0135 code.
  • Start the engine and allow it to reach operating temperature.