what does it mean if my BMW X5 F15 (2014-2019) is showing the P0135 code

Solution

1. Preparation

• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.
• Gather necessary tools and parts.

2. Remove the Oxygen Sensor

• Locate the bank 1 sensor 1 oxygen sensor (usually positioned before the catalytic converter).
• Use an oxygen sensor socket to carefully unscrew and remove the sensor from the exhaust pipe.
• Take care not to damage the threads in the exhaust.

3. Inspect and Test the Sensor

• Visually inspect the old sensor for any signs of damage or excessive carbon buildup.
• Use a multimeter to check the resistance of the heater element in the sensor (typically between 10-30 ohms).
• If the resistance is out of specification, the sensor needs replacement.

4. Install New Oxygen Sensor

• Apply anti-seize compound to the threads of the new oxygen sensor (be cautious not to get any on the sensor tip).
• Screw the new oxygen sensor into place by hand, then tighten it with an oxygen sensor socket to the manufacturer's recommended torque specification (usually around 30 lb-ft).
• Reconnect the electrical connector securely.

5. Reconnect Battery and Clear Codes

• Reconnect the battery terminals, ensuring a secure connection.
• Use an OBD-II scanner to clear the P0135 code from the ECU.
• Start the engine and allow it to reach operating temperature.