how to fix P0135 code in Honda Accord 8th Generation (2008-2012)

Learn how to diagnose and fix P0135 oxygen sensor circuit issues in Honda Accord 2008-2012. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal for safety.
• Allow the engine to cool down if it has been running.

2. Remove the Oxygen Sensor

• Locate the upstream oxygen sensor (usually found before the catalytic converter).
• Use an oxygen sensor socket to carefully unscrew and remove the sensor from the exhaust manifold.
• Disconnect the electrical connector from the sensor.

3. Inspect and Repair

• Inspect the Wiring:
  • Examine the oxygen sensor wiring harness for fraying, corrosion, or damage.
  • Repair or replace damaged wires as necessary.
• Check the Connector:
  • Clean the oxygen sensor connector to ensure a good electrical connection.
  • Replace the connector if it shows signs of significant wear or corrosion.

4. Install New Oxygen Sensor

• Apply anti-seize compound to the threads of the new oxygen sensor (if not pre-coated).
• Install the new oxygen sensor into the exhaust manifold and tighten it to the manufacturer’s specified torque (typically around 30 lb-ft).
• Reconnect the electrical connector securely.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use an OBD-II scanner to clear the P0135 code from the vehicle's computer.
• Start the engine and allow it to reach normal operating temperature while monitoring for any codes or issues.