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Home/Cars/Ford/F-150/Fourteenth Generation (2021-present)/how to resolve P0135 code on my Ford F-150 Fourteenth Generation (2021-present)

how to resolve P0135 code on my Ford F-150 Fourteenth Generation (2021-present)

Ford F-150 Fourteenth Generation (2021-present)

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

Problem Statement

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.

Error Code
P0135
Affected Component
Engine
Estimated Time
1-2 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow the exhaust system to cool before handling components.

Symptoms

  • •Check engine light illuminated
  • •Poor fuel economy
  • •Rough engine idle
  • •Increased emissions
  • •Engine stalling during acceleration

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm the P0135 code.
  2. 2Visually inspect the wiring and connectors leading to the upstream oxygen sensor for damage or corrosion.
  3. 3Check the fuse related to the oxygen sensor heater circuit using the vehicle's fuse diagram.
  4. 4Measure the resistance of the oxygen sensor heater circuit with a multimeter to ensure it is within specification.
  5. 5Test the voltage supply to the oxygen sensor heater circuit with a multimeter while the engine is running.
  6. 6Inspect the oxygen sensor itself for signs of wear or failure.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Disconnect the battery to ensure safety while working with electrical components.

2. Inspect and Repair Wiring

  • Sub-steps:
    1. Remove the engine cover if necessary for access.
    2. Inspect the wiring harness for frays, shorts, or disconnections.
    3. Repair any damaged wires using solder and heat shrink tubing.
    4. Ensure connectors are clean and secure.

3. Replace Oxygen Sensor

  • Tools Required:
    • Oxygen sensor socket
    • Wrench set
    • Torque wrench
  • Sub-steps:
    1. Locate the upstream oxygen sensor on the exhaust manifold.
    2. Disconnect the electrical connector from the oxygen sensor.
    3. Use the oxygen sensor socket to unscrew the old sensor from the exhaust system.
    4. Apply anti-seize compound to the threads of the new oxygen sensor.
    5. Install the new sensor and tighten it to the manufacturer's specified torque (usually around 30 lb-ft).
    6. Reconnect the electrical connector.

4. Clear Codes and Test

  • Sub-steps:
    1. Reconnect the battery.
    2. Use an OBD-II scanner to clear the P0135 code.
    3. Start the engine and allow it to reach operating temperature.
    4. Monitor the engine for any abnormal behavior or reoccurrence of the code.

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
  • •Wrench set
  • •Torque wrench

Parts Required

  • •Upstream oxygen sensor (specific to Ford F-150)
  • •Anti-seize compound

Additional Information

Error Code
P0135
Affected Component
Engine
Estimated Time
1-2 hours
Difficulty
medium
Severity
medium
Tools Required
5 items
Parts Required
2 items

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