how to fix P0135 code on Ford Explorer Fifth Generation (2011-2019)

Ford Explorer Fifth Generation (2011-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0135

3 min read

514 words

Problem Statement

Learn how to diagnose and fix P0135 oxygen sensor heater circuit issues in Ford Explorer (2011-2019). Step-by-step guide with tools and procedures.

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 down before servicing to avoid burns.

Symptoms

•Check engine light illuminated
•Poor fuel economy
•Rough idle
•Increased emissions
•Failed emissions test

Diagnostic Steps

1
Scan the vehicle's computer using an OBD-II scanner to confirm the P0135 code and check for any additional codes.
2
Visually inspect the wiring and connectors for the Bank 1 Sensor 1 oxygen sensor for any signs of damage or corrosion.
3
Measure the resistance of the heater element in the oxygen sensor using a multimeter to ensure it is within the manufacturer’s specified range.
4
Check the power and ground circuits at the oxygen sensor connector to ensure proper voltage and ground are present.
5
Inspect the fuse related to the oxygen sensor heater circuit for continuity and replace it if blown.
6
If necessary, perform a continuity test on the wiring harness between the oxygen sensor and the engine control module (ECM).

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
•Wire harness repair kit

Parts Required

•New Oxygen Sensor (Bank 1 Sensor 1)

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Diagnostic Steps

1
Scan the vehicle's computer using an OBD-II scanner to confirm the P0135 code and check for any additional codes.
2
Visually inspect the wiring and connectors for the Bank 1 Sensor 1 oxygen sensor for any signs of damage or corrosion.
3
Measure the resistance of the heater element in the oxygen sensor using a multimeter to ensure it is within the manufacturer’s specified range.
4
Check the power and ground circuits at the oxygen sensor connector to ensure proper voltage and ground are present.
5
Inspect the fuse related to the oxygen sensor heater circuit for continuity and replace it if blown.
6
If necessary, perform a continuity test on the wiring harness between the oxygen sensor and the engine control module (ECM).

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to prevent electrical short circuits.

Tools Required:

OBD-II scanner
Multimeter
Socket set
Torque wrench
Wire harness repair kit (if needed)

2. Replace Oxygen Sensor

Locate the Bank 1 Sensor 1 oxygen sensor (typically on the exhaust manifold or upstream of the catalytic converter).
Disconnect the wiring harness from the oxygen sensor.
Use a socket wrench to remove the oxygen sensor from the exhaust system.
Install the new oxygen sensor by screwing it into place and tightening it to the manufacturer's torque specifications (typically around 30-40 ft-lbs).
Reconnect the wiring harness to the new oxygen sensor.

3. Reconnect Battery and Clear Codes

Reconnect the vehicle's battery terminals.
Use the OBD-II scanner to clear the P0135 code from the vehicle’s computer.

4. Test Drive and Monitor

Start the engine and allow it to reach operating temperature.
Perform a test drive to ensure the check engine light remains off and monitor the system for proper operation.