how to fix the P0138 code on my Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool completely.

2. Remove the Oxygen Sensor

• Tools Required: O2 sensor socket, ratchet, and extension.
• Locate Bank 1 Sensor 2, typically found after the catalytic converter.
• Use the O2 sensor socket to unscrew and remove the oxygen sensor from the exhaust pipe.

3. Inspect and Clean

• Check the sensor connector for corrosion or damage.
• Clean the connector and surrounding area with electrical contact cleaner to ensure good electrical connection.

4. Install the New Oxygen Sensor

• Tools Required: O2 sensor socket, ratchet, and extension.
• Apply anti-seize compound to the threads of the new oxygen sensor (if not pre-applied).
• Install the new sensor into the exhaust pipe and tighten it to the manufacturer’s specifications (typically 30-40 ft-lbs).

5. Reconnect the Battery

• Reconnect the negative battery terminal securely after replacing the sensor.

6. Clear Codes and Test Drive

• Use the OBD-II scanner to clear the P0138 code.
• Test drive the vehicle to ensure the code does not reappear and monitor for proper oxygen sensor readings.