how to fix P0135 code in Ford F-150 Fourteenth Generation (2021-present)

Learn how to diagnose and fix P0135 oxygen sensor heater circuit issues in Ford F-150. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, wire connectors, and possibly a replacement oxygen sensor.
• Disconnect the vehicle's battery to ensure safety during repairs.

2. Inspect and Repair Wiring

• Sub-steps:
  1. Remove the protective covering of the oxygen sensor wiring harness.
  2. Inspect all wiring for frays, breaks, or corrosion.
  3. Repair any damaged wires using heat shrink tubing and solder or appropriate wire connectors.
  4. Re-secure the wiring harness to prevent future damage.

3. Replace Oxygen Sensor

• Sub-steps:
  1. Locate the Bank 1 Sensor 1 oxygen sensor, typically found in the exhaust manifold or front of the catalytic converter.
  2. Use a socket wrench to carefully unscrew the old oxygen sensor from its position.
  3. Apply anti-seize compound to the threads of the new oxygen sensor before installation.
  4. Install the new oxygen sensor and tighten it to the manufacturer's torque specification (usually around 30 lb-ft).
  5. Reconnect the electrical connector to the new oxygen sensor.

4. Final Checks

• Sub-steps:
  1. Reconnect the vehicle's battery.
  2. Start the engine and allow it to reach operating temperature.
  3. Monitor the new oxygen sensor with the OBD-II scanner to ensure the P0135 code does not reappear.