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Home/Cars/Ford/F-150/Fourteenth Generation (2021-present)/what does it mean when my Ford F-150 shows a P0135 code

what does it mean when my Ford F-150 shows a P0135 code

Ford F-150 Fourteenth Generation (2021-present)

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

Problem Statement

Learn how to diagnose and fix P0135 oxygen sensor circuit issue in Ford F-150. Step-by-step guide with diagnostic procedures and repair instructions.

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

Safety Warnings

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

Symptoms

  • •Check engine light illuminated
  • •Poor fuel economy
  • •Engine may run rough or hesitate
  • •Increased emissions
  • •Failed emissions test (if applicable)

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm P0135 and check for any additional codes.
  2. 2Visually inspect the wiring and connectors for Bank 1 Sensor 1 for damage, corrosion, or loose connections.
  3. 3Check the oxygen sensor’s heater circuit by measuring resistance using a multimeter.
  4. 4Test the voltage supply and ground at the oxygen sensor connector.
  5. 5Use a scan tool to monitor the oxygen sensor data while the engine is running to check for proper operation.

Solution

Solution

1. Preparation

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

2. Inspect and Repair Wiring

  • Tools Required: Multimeter, wire strippers, electrical tape
  • Check for damaged wiring or connectors. Repair or replace as necessary.
  • Use electrical tape to secure any splices or damaged insulation to prevent further issues.

3. Replace Oxygen Sensor

  • Tools Required: Oxygen sensor socket, ratchet, torque wrench
  • Locate Bank 1 Sensor 1 oxygen sensor (typically before the catalytic converter).
  • Use the oxygen sensor socket to unscrew the old sensor.
  • Apply anti-seize compound to the threads of the new sensor to prevent seizing.
  • Install the new sensor and tighten it to manufacturer specifications (usually around 30-40 ft-lbs).

4. Clear Codes and Test

  • Reconnect the battery.
  • Use an OBD-II scanner to clear the P0135 code.
  • Start the engine and allow it to reach operating temperature.
  • Verify the oxygen sensor is functioning properly by monitoring data with the scan tool.

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
  • •Torque wrench
  • •Wire strippers
  • •Electrical tape

Parts Required

  • •New oxygen sensor for Bank 1 Sensor 1

Additional Information

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

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