how to fix a P0135 code on Ford F-150 12th Generation (2009-2014)

Learn how to diagnose and fix P0135 oxygen sensor heater circuit issues in Ford F-150 (2009-2014). Step-by-step guide with tools and procedures.

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Multimeter
• Socket set
• Torque wrench
• Pliers

2. Remove the Oxygen Sensor

• Locate the Bank 1 Sensor 1 oxygen sensor, which is typically found in the exhaust manifold or front of the catalytic converter.
• Use a socket to carefully unscrew the oxygen sensor from its location.

3. Inspect and Test the Oxygen Sensor

• Check the oxygen sensor for any signs of damage or contamination.
• Use a multimeter to test the heater circuit: connect the multimeter probes to the heater terminals and measure resistance. It should typically be between 5-30 ohms.
• If the resistance is out of specifications, replace the oxygen sensor.

4. Check Wiring and Connectors

• Inspect the wiring harness for frays, breaks, or corrosion.
• Ensure all connectors are clean and secure. If any connectors are damaged, replace them.

5. Install the New Oxygen Sensor

• If replacing the sensor, apply anti-seize compound to the threads of the new oxygen sensor.
• Install the new sensor and tighten it to the manufacturer’s specifications (usually around 30-40 ft-lbs).

6. 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.