how to fix the P0138 code on Honda Civic 11th Generation (2022-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool completely.

2. Inspect Wiring and Connectors

• Visually inspect the oxygen sensor wiring harness for frays, breaks, or corrosion.
• Use a multimeter to test the continuity of the wires from the ECM to the oxygen sensor.
• Repair or replace any damaged wiring or connectors as necessary.

3. Replace the Oxygen Sensor

• Locate the upstream oxygen sensor (typically near the exhaust manifold).
• Use an oxygen sensor socket to remove the old sensor carefully.
• Apply anti-seize compound to the threads of the new sensor (avoid getting it on the sensor tip).
• Install the new oxygen sensor and tighten it to the manufacturer’s specifications (usually around 30 ft-lbs).
• Reconnect the oxygen sensor connector securely.

4. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use an OBD-II scanner to clear the P0138 code from the ECM.
• Start the engine and check for any reoccurring codes.