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

Ford F-150 13th Generation (2015-2020)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

Error Code: P0135

3 min read

511 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

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

Error Code

P0135

Affected Component

Exhaust System

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

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

Symptoms

•Check engine light illuminated
•Poor fuel economy
•Rough idle or stalling
•Increased emissions during inspection
•Engine hesitation or loss of power during acceleration

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0135 code and check for additional codes.
2
Inspect the wiring and connectors for the upstream oxygen sensor for any visible damage or corrosion.
3
Measure the voltage output of the upstream oxygen sensor using a multimeter while the engine is running.
4
Check the fuse related to the oxygen sensor circuit to ensure it is not blown.
5
Verify the heater circuit operation of the oxygen sensor by measuring resistance across the heater terminals.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

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
•Torque wrench
•Wire strippers/crimpers

Parts Required

•New upstream oxygen sensor (Bank 1, Sensor 1)
•Anti-seize compound

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0135 code and check for additional codes.
2
Inspect the wiring and connectors for the upstream oxygen sensor for any visible damage or corrosion.
3
Measure the voltage output of the upstream oxygen sensor using a multimeter while the engine is running.
4
Check the fuse related to the oxygen sensor circuit to ensure it is not blown.
5
Verify the heater circuit operation of the oxygen sensor by measuring resistance across the heater terminals.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to prevent electrical shock.
Raise the vehicle safely using jack stands if access to the undercarriage is required.

2. Inspect and Repair Wiring

Sub-steps:
- Visually inspect the wiring harness and connectors leading to the upstream oxygen sensor.
- Repair or replace any damaged wires or connectors as necessary.
Tools Required: Wire strippers/crimpers, electrical tape, heat shrink tubing.

3. Replace the Oxygen Sensor

Sub-steps:
- Locate the upstream oxygen sensor (Bank 1, Sensor 1) typically located before the catalytic converter.
- Disconnect the sensor's electrical connector.
- Use an oxygen sensor socket to remove the sensor from the exhaust manifold.
- Apply anti-seize compound to the threads of the new sensor.
- Install the new oxygen sensor and torque it to the manufacturer's specification (usually around 30 lb-ft).
- Reconnect the electrical connector.
Tools Required: Oxygen sensor socket, torque wrench, anti-seize compound.

4. Clear Codes and Test Drive

Sub-steps:
- Reconnect the battery.
- Use the OBD-II scanner to clear the P0135 code.
- Start the engine and allow it to reach operating temperature.
- Perform a test drive to ensure proper operation and monitor for any return of the check engine light.
Tools Required: OBD-II scanner.