how to fix P0135 error code on my Ford F-150 13th Generation (2015-2020)

Learn how to diagnose and fix P0135 oxygen sensor heater issues in Ford F-150 (2015-2020). Step-by-step guide with tools and procedures.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the ignition is off.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect Wiring and Connectors

• Remove the protective cover to access the oxygen sensor wiring.
• Visually inspect the wiring harness and connectors for frays, breaks, or corrosion.
• Clean any corrosion with electrical contact cleaner and a wire brush if necessary.

3. Replace Oxygen Sensor (if faulty)

• Tools Required: Oxygen sensor socket, ratchet, torque wrench.
• Locate the upstream oxygen sensor on the exhaust manifold.
• Disconnect the electrical connector from the oxygen sensor.
• Use an oxygen sensor socket to unscrew the old sensor from the exhaust manifold.
• Apply anti-seize compound to the threads of the new oxygen sensor.
• Install the new oxygen sensor and tighten it to the manufacturer's specifications (usually around 30-40 lb-ft).
• Reconnect the electrical connector.

4. Check and Replace Fuse (if blown)

• Locate the fuse box and identify the fuse for the oxygen sensor heater circuit.
• Remove the fuse and check for continuity using a multimeter.
• Replace with a new fuse of the same amperage if the old fuse is blown.

5. 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.
• Start the engine and let it run for a few minutes to ensure everything is functioning properly.