how to fix P0135 code in Ford Explorer Sixth Generation (2020-present)

Ford Explorer Sixth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0135

3 min read

463 words

Problem Statement

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

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 engine to cool before working on exhaust components.

Symptoms

•Check engine light illuminated
•Poor fuel economy
•Rough idle
•Engine misfires
•Increased emissions

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0135 and check for any additional codes.
2
Inspect the wiring and connectors for the upstream oxygen sensor for damage or corrosion.
3
Measure the voltage at the oxygen sensor heater circuit using a multimeter.
4
Check the fuse related to the oxygen sensor heater circuit.
5
Test the resistance of the oxygen sensor heater element.

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
•Socket set
•Torque wrench
•Safety gloves

Parts Required

•Upstream oxygen sensor (OEM or equivalent)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0135 and check for any additional codes.
2
Inspect the wiring and connectors for the upstream oxygen sensor for damage or corrosion.
3
Measure the voltage at the oxygen sensor heater circuit using a multimeter.
4
Check the fuse related to the oxygen sensor heater circuit.
5
Test the resistance of the oxygen sensor heater element.

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, safety gloves.
Disconnect the battery to ensure safety while working on electrical components.

2. Visual Inspection

Inspect the upstream oxygen sensor wiring harness for any signs of fraying, corrosion, or damage.
Ensure that the connectors are secure and free from dirt or moisture.

3. Testing the Oxygen Sensor

Sub-step: Use a multimeter to measure the resistance of the oxygen sensor heater element. It should typically be within the manufacturer's specified range (refer to the service manual).
If the reading is outside this range, the oxygen sensor needs to be replaced.

4. Replacing the Oxygen Sensor

Sub-step 1: Remove the oxygen sensor using a socket set. Make sure to use a sensor socket for easier removal.
Sub-step 2: Install the new oxygen sensor and torque it to the manufacturer's specifications (usually around 30-40 lb-ft).
Sub-step 3: Reconnect the oxygen sensor harness, ensuring a secure fit.

5. Final Steps

Reconnect the battery.
Clear the error codes using the OBD-II scanner and start the engine.
Allow the engine to reach operating temperature while monitoring for any further codes or issues.