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Home/Cars/Ford/F-150/12th Generation (2009-2014)/how to fix P0135 code in Ford F-150 12th Generation (2009-2014)

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

Ford F-150 12th Generation (2009-2014)

Error Codes
Severity: mediumDifficulty: mediumError Code: P01351-2 hours
3 min read
591 words

Problem Statement

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.

Error Code
P0135
Affected Component
Exhaust System
Estimated Time
1-2 hours

Safety Warnings

  • ⚠Disconnect battery before working on electrical systems.
  • ⚠Allow engine to cool before working on exhaust components to avoid burns.

Symptoms

  • •Check engine light illuminated
  • •Rough idle
  • •Decreased fuel efficiency
  • •Engine stalling during acceleration
  • •Failed emissions test
  • •Increased exhaust emissions

Diagnostic Steps

  1. 1Scan the vehicle's OBD-II system for error codes to confirm P0135 and check for any additional related codes.
  2. 2Inspect the wiring and connector for the upstream oxygen sensor (Bank 1 Sensor 1) for damage, corrosion, or loose connections.
  3. 3Measure the resistance of the oxygen sensor heater circuit using a multimeter to ensure it is within specifications (typically under 15 ohms).
  4. 4Check the vehicle's fuses related to the oxygen sensor heater circuit for any blown fuses.
  5. 5Perform a visual inspection of the oxygen sensor itself for signs of wear or contamination.
  6. 6Test the voltage supplied to the heater circuit while the engine is running to verify that the sensor is receiving power.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Disconnect the negative battery terminal to prevent electrical shock.
  • Allow the engine to cool down completely.

2. Remove and Inspect the Oxygen Sensor

  • Tools Required: Oxygen sensor socket, ratchet, extension.
  • Using the oxygen sensor socket, carefully unscrew the oxygen sensor from the exhaust manifold.
  • Inspect the sensor for any signs of damage or contamination (e.g., carbon buildup, excessive wear).

3. Repair or Replace Components

  • If the oxygen sensor is damaged, replace it with a new one (ensure it is compatible with the Ford F-150).
  • Check the wiring harness and connector; repair any damaged wires or connections with solder and heat shrink tubing if necessary.
  • If the fuse for the oxygen sensor heater circuit is blown, replace it with a fuse of the same amperage.

4. Install New or Repaired Oxygen Sensor

  • Apply a small amount of anti-seize compound to the threads of the new oxygen sensor (if applicable).
  • Install the oxygen sensor back into the exhaust manifold and tighten it to the manufacturer’s specifications (typically around 30 lb-ft).
  • Reconnect the wiring harness and ensure the connections are secure.

5. Reconnect Battery and Clear Codes

  • Reconnect the negative battery terminal.
  • Use the OBD-II scanner to clear the trouble codes from the vehicle's computer.

Verification

After completing the repair, verify that the issue has been resolved:

  • ✓Test the affected component to ensure it functions correctly
  • ✓Check for any error codes or warning lights
  • ✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • •OBD-II scanner
  • •Multimeter
  • •Oxygen sensor socket
  • •Ratchet
  • •Extension
  • •Soldering iron
  • •Heat shrink tubing

Parts Required

  • •Oxygen sensor (Bank 1 Sensor 1)
  • •Fuse (if blown)

Additional Information

Error Code
P0135
Affected Component
Exhaust System
Estimated Time
1-2 hours
Difficulty
medium
Severity
medium
Tools Required
7 items
Parts Required
2 items

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