how to fix the P0135 code on my Honda Accord 10th Generation (2018-2022)

Learn how to diagnose and fix P0135 oxygen sensor heater circuit issues in Honda Accord 10th Generation. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, wire brush, dielectric grease.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Wiring

• Sub-steps:
  1. Remove the vehicle's under-hood cover if applicable to access the oxygen sensor wiring.
  2. Visually inspect the wiring and connectors for any signs of wear, damage, or corrosion.
  3. Clean any corroded connectors with a wire brush and apply dielectric grease to prevent future corrosion.
  4. Repair or replace any damaged wiring as necessary.

3. Replace the Oxygen Sensor

• Sub-steps:
  1. Locate the Bank 1 Sensor 1 oxygen sensor, which is typically near the exhaust manifold.
  2. Disconnect the sensor's electrical connector.
  3. Use a socket wrench to remove the old oxygen sensor, taking care not to damage the threads in the exhaust.
  4. Apply anti-seize compound to the threads of the new sensor (if applicable).
  5. Install the new oxygen sensor and tighten it to the manufacturer's specified torque (usually around 30 ft-lbs).
  6. Reconnect the electrical connector.

4. Clear Codes and Test Drive

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the P0135 code from the ECU.
  3. Start the engine and allow it to reach operating temperature.
  4. Take the vehicle for a test drive, monitoring engine performance and checking for the re-appearance of the check engine light.