why does my Honda Accord Eleventh Generation (2023-present) have a check engine light with P0135 cod...

Learn how to diagnose and fix P0135 oxygen sensor issues in the 2023 Honda Accord. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery cable to prevent electrical shorts.
• Allow the engine to cool down before proceeding.

2. Inspect and Replace Oxygen Sensor

• Tools Required: O2 sensor socket, ratchet, torque wrench, wire brush, multimeter.
• Sub-steps:
  1. Locate the upstream oxygen sensor on the exhaust manifold.
  2. Disconnect the electrical connector from the oxygen sensor.
  3. Use the O2 sensor socket to remove the sensor from the exhaust pipe.
  4. Clean the mounting threads in the exhaust pipe with a wire brush.
  5. Install the new oxygen sensor by hand to avoid cross-threading, then tighten it with the O2 sensor socket to the manufacturer's specified torque (typically around 30-35 ft-lbs).
  6. Reconnect the electrical connector to the new oxygen sensor.

3. Clear Codes and Reconnect Battery

• Sub-steps:
  1. Reconnect the negative battery cable.
  2. Use the OBD-II scanner to clear the P0135 code from the engine control module.

4. Final Checks

• Sub-steps:
  1. Start the engine and let it reach normal operating temperature.
  2. Monitor for any check engine light reappearance or new codes.