how to fix P0135 O2 sensor code in Ford F-150 14th Generation (2021-2024)

Learn how to diagnose and fix P0135 O2 sensor code in Ford F-150 (2021-2024). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather required tools and ensure the vehicle is parked on a flat surface.
• Disconnect the negative battery cable to prevent any electrical shorts.

2. Inspect and Replace Oxygen Sensor

• Sub-steps:
  1. Locate the upstream oxygen sensor, which is typically near the exhaust manifold.
  2. Disconnect the electrical connector from the oxygen sensor by pressing the release tab.
  3. Use an oxygen sensor socket or a wrench to unscrew the oxygen sensor from the exhaust pipe.
  4. Compare the old sensor with the new one to ensure proper fit.
  5. Apply anti-seize compound to the threads of the new oxygen sensor.
  6. Install the new oxygen sensor by threading it into the exhaust pipe and tightening it to the manufacturer’s specifications (usually around 30 lb-ft).
  7. Reconnect the electrical connector securely.

3. Check and Replace Wiring/Connector (if necessary)

• Sub-steps:
  1. Inspect the wiring for any frays, breaks, or corrosion.
  2. If damage is found, cut and splice in new wiring using solder and heat-shrink tubing for a secure connection.
  3. Replace any corroded connectors with new ones, ensuring a solid connection.

4. Check Fuses

• Sub-steps:
  1. Locate the fuse box and identify the fuse related to the oxygen sensor heater circuit.
  2. Remove the fuse and inspect it for continuity; replace if it is blown.