how to fix a P0138 code in my Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the exhaust system to cool before working on the oxygen sensor.

2. Locate and Remove the Oxygen Sensor

• Locate Bank 1 Sensor 2, which is typically found on the exhaust pipe after the catalytic converter.
• Use a socket wrench to unscrew the oxygen sensor. Be cautious of any residual heat.

3. Inspect and Clean

• Inspect the connector and wiring harness for damage; repair or replace as necessary.
• Clean the oxygen sensor threads and the area where it screws into the exhaust to ensure a good seal.

4. Install New Oxygen Sensor

• Apply anti-seize compound to the threads of the new oxygen sensor (if applicable).
• Install the new oxygen sensor by threading it into the exhaust pipe and tightening it to manufacturer specifications (usually around 30 lb-ft).
• Reconnect the wiring harness securely.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0138 code from the vehicle’s computer.