how to fix P0135 oxygen sensor issue in BMW X5 G05 (2019-2024)

Solution

1. Preparation

• Gather required tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the vehicle to cool down if the engine has been running.

2. Remove the Oxygen Sensor

• Tools Required: O2 sensor socket or wrench, ratchet, and extension.
• Locate the faulty oxygen sensor (upstream or downstream, depending on diagnosis).
• Using the O2 sensor socket, carefully unscrew the sensor from its mounting location.
• Disconnect the wiring harness from the oxygen sensor.

3. Inspect and Clean

• Visually inspect the oxygen sensor connector and wiring for damage.
• Clean any corrosion from the connector using electrical contact cleaner to ensure a good connection.
• If any damage is found, replace the wiring harness or connector as needed.

4. Install New Oxygen Sensor

• Parts Required: New oxygen sensor (ensure it matches OEM specifications).
• Connect the new oxygen sensor to the wiring harness.
• Carefully thread the sensor into the exhaust system without cross-threading.
• Tighten the sensor to the manufacturer's specifications (generally around 30-35 Nm or 22-26 lb-ft).

5. Reconnect Battery and Test

• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.
• Check for leaks around the oxygen sensor.
• Monitor the sensor operation using a scan tool if available.