how to troubleshoot my Honda Civic 11th Generation (2022-Present) with a P0135 code?

Learn how to troubleshoot and fix P0135 oxygen sensor heater circuit issue in Honda Civic 2022. Step-by-step guide with diagnostic and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface, and the engine is turned off and cool.
• Disconnect the negative battery terminal.

2. Inspect Wiring and Connectors

• Tools Required: Visual inspection tools (flashlight), multimeter.
• Sub-steps:
  • Visually inspect the wiring harness connected to the upstream O2 sensor for fraying or damage.
  • Check connectors for corrosion or loose connections.
  • Repair or replace any damaged wiring or connectors.

3. Replace the Oxygen Sensor

• Tools Required: O2 sensor socket, ratchet and extension, torque wrench.
• Parts Required: New upstream oxygen sensor.
• Sub-steps:
  • Locate the upstream O2 sensor on the exhaust manifold.
  • Use the O2 sensor socket to unscrew the old sensor counterclockwise.
  • Apply anti-seize compound to the threads of the new O2 sensor.
  • Install the new sensor by screwing it in clockwise and tighten it to the manufacturer's torque specification.

4. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0135 code from the vehicle’s computer.

5. Test Drive the Vehicle

• Take the vehicle for a test drive to monitor for any reoccurrence of the check engine light.