how to fix the P0135 code on my Honda Civic 11th Generation (2022-Present)

Learn how to diagnose and fix P0135 oxygen sensor heater circuit issue in Honda Civic 11th Generation. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Needed: OBD-II scanner, multimeter, socket set, torque wrench, and a repair manual for torque specifications.
• Safety Warning: Disconnect the battery before working on electrical components.

2. Inspect and Repair Wiring

• a. Visual Inspection: Check the oxygen sensor wiring harness for fraying, cracking, or any signs of damage.
• b. Repair or Replace: If damage is found, repair the wiring using heat shrink tubing and solder. If the wiring is extensively damaged, replace the entire harness.

3. Replace Oxygen Sensor

• a. Remove Old Sensor:
  • Use a socket set to unscrew the old oxygen sensor from the exhaust manifold.
  • Tools Required: Oxygen sensor socket.
• b. Install New Sensor:
  • Apply anti-seize compound to the threads of the new oxygen sensor.
  • Screw it into the exhaust manifold and tighten it to the manufacturer’s specifications using the torque wrench.

4. Verify Circuit Functionality

• a. Check Voltage Supply:
  • With the ignition on (engine off), check the voltage at the oxygen sensor connector. It should read around 12V.
• b. Test Heater Element:
  • Measure the resistance of the heater element in the new sensor. It should typically be between 7-14 ohms.

5. Clear Codes and Test

• a. Reset the ECU:
  • Use the OBD-II scanner to clear the P0135 code from the ECU.
• b. Test Drive:
  • Take the vehicle for a test drive to ensure the code does not return and the engine operates smoothly.