how to fix the P0138 code on my Honda Accord 9th Generation (2013-2017)

Learn how to diagnose and fix P0138 oxygen sensor issue in Honda Accord 2013-2017. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, socket set, torque wrench, and safety gloves.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Repair Wiring

• Sub-step 1: Remove the underbody cover to access the oxygen sensor wiring.
• Sub-step 2: Visually inspect the wiring harness for fraying, corrosion, or damage.
• Sub-step 3: Use a multimeter to check continuity in the wires. Repair or replace any damaged wiring.

3. Replace Downstream Oxygen Sensor

• Sub-step 1: Locate the downstream oxygen sensor (usually located before the catalytic converter).
• Sub-step 2: Disconnect the electrical connector from the oxygen sensor.
• Sub-step 3: Use a socket wrench to remove the old oxygen sensor from the exhaust pipe.
• Sub-step 4: Apply anti-seize compound to the threads of the new oxygen sensor.
• Sub-step 5: Install the new oxygen sensor and torque it to the manufacturer’s specifications (usually around 30 lb-ft).
• Sub-step 6: Reconnect the electrical connector to the new oxygen sensor.

4. Reset the ECM

• Sub-step 1: Reconnect the battery.
• Sub-step 2: Use the OBD-II scanner to clear the stored error codes from the ECM.