how to fix P0135 code on my Honda Accord Eleventh Generation (2023-present)?

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

Solution

1. Preparation

• Gather necessary tools and parts.
• 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

• Tools Required: Wire cutters, soldering iron, heat shrink tubing, electrical tape.
• Inspect the wiring harness and connectors for any frayed wires or poor connections.
• Repair any damaged wires by cutting out the bad section and splicing in new wire using solder or appropriate connectors.
• Ensure all connections are secure and insulated with electrical tape or heat shrink tubing.

3. Replace the Oxygen Sensor

• Tools Required: O2 sensor socket, ratchet and extension, penetrating oil (if necessary).
• Locate the upstream oxygen sensor (usually before the catalytic converter).
• Apply penetrating oil to the sensor threads if they are rusted.
• Using the O2 sensor socket, carefully remove the old oxygen sensor.
• Install the new oxygen sensor by threading it into the exhaust pipe and tightening it to the manufacturer's specifications (typically 30-40 lb-ft).
• Reconnect the sensor's electrical connector.

4. Reset the ECU

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0135 code from the system.
• Start the engine and allow it to reach operating temperature.