how to fix P0135 code in Honda Civic 9th Generation (2012-2015)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on the electrical components.

2. Replace the Upstream Oxygen Sensor

1. Locate the Upstream O2 Sensor:

   • The upstream O2 sensor is typically located before the catalytic converter on the exhaust manifold.

2. Remove the Old O2 Sensor:

   • Use an O2 sensor socket or a wrench to carefully unscrew the sensor from the exhaust pipe.
   • Disconnect the electrical connector from the sensor.

3. Install the New O2 Sensor:

   • Apply anti-seize compound on the threads of the new O2 sensor (if not pre-applied).
   • Thread the new sensor into the exhaust pipe and tighten it to the manufacturer's torque specifications (usually around 30 ft-lbs, but verify with the service manual).
   • Reconnect the electrical connector to the new sensor.

3. Clear the Error Code

• Reconnect the battery.
• Use the OBD-II scanner to clear the P0135 code from the ECU.

4. Test the Repair

• Start the engine and allow it to reach operating temperature.
• Perform a drive cycle to check if the check engine light reappears and to monitor the performance of the new O2 sensor.