how to fix the P0138 code in my Honda Accord 10th Generation (2018-2022)

Learn how to diagnose and fix P0138 high voltage from oxygen sensor in Honda Accord 10th Generation. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Raise the vehicle securely on jack stands if needed.

2. Inspect and Repair Wiring

• Sub-steps:
  • Remove any protective coverings over the wiring harness leading to the sensor.
  • Visually inspect the wires for fraying, breaks, or corrosion.
  • Repair or replace damaged wiring as necessary.
• Tools Required: Wire strippers, electrical tape, heat shrink tubing.

3. Replace Oxygen Sensor

• Sub-steps:
  • Locate bank 1 sensor 2, which is usually positioned after the catalytic converter.
  • Disconnect the sensor’s electrical connector.
  • Use an oxygen sensor socket to remove the old sensor.
  • Apply anti-seize compound to the threads of the new sensor before installation.
  • Install the new sensor and reconnect the electrical connector.
• Tools Required: Oxygen sensor socket, ratchet, torque wrench.
• Torque Specifications: Typically 30-40 lb-ft for oxygen sensors (check specific vehicle manual).

4. Clear Codes and Test Drive

• Sub-steps:
  • Reconnect the battery.
  • Use an OBD-II scanner to clear the P0138 code from the ECM.
  • Test drive the vehicle for at least 20 minutes to ensure the code does not reappear.
• Tools Required: OBD-II scanner.