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

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0135

3 min read

517 words

Problem Statement

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

Error Code

P0135

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before starting any repairs on exhaust components.

Symptoms

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

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0135 code.
2
Inspect the wiring and connectors of the upstream oxygen sensor for any visible damage or corrosion.
3
Test the oxygen sensor heater circuit using a multimeter to check for continuity and proper voltage.
4
Check the fuse related to the oxygen sensor heater circuit to ensure it is not blown.
5
Verify the engine's operating temperature to ensure it reaches the required levels for the sensor to function properly.

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
•Wiring harness repair kit

Parts Required

•Upstream oxygen sensor (Bank 1 Sensor 1)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0135 code.
2
Inspect the wiring and connectors of the upstream oxygen sensor for any visible damage or corrosion.
3
Test the oxygen sensor heater circuit using a multimeter to check for continuity and proper voltage.
4
Check the fuse related to the oxygen sensor heater circuit to ensure it is not blown.
5
Verify the engine's operating temperature to ensure it reaches the required levels for the sensor to function properly.

Solution

1. Preparation

Gather tools: OBD-II scanner, multimeter, socket set, torque wrench, and wiring harness repair kit if necessary.
Ensure the vehicle is parked on a level surface, and the engine is cool.
Disconnect the negative terminal of the battery to prevent any electrical shorts.

2. Inspect and Repair Wiring

Sub-step 1: Visually inspect the wiring harness leading to the oxygen sensor. Look for any frayed wires, corrosion, or loose connections.
Sub-step 2: If damage is found, repair the wiring using a wiring harness repair kit. Ensure all connections are secure and insulated to prevent future issues.

3. Test and Replace Oxygen Sensor

Sub-step 1: Using a multimeter, check the resistance of the oxygen sensor heater circuit. If the resistance is out of specification (consult the vehicle’s service manual for specific values), proceed to replace the sensor.
Sub-step 2: Remove the old oxygen sensor using a socket wrench. Apply anti-seize compound to the threads of the new sensor.
Sub-step 3: Install the new oxygen sensor, tightening it to the manufacturer’s specified torque (usually around 30 lb-ft).

4. Reconnect Battery and Clear Codes

Sub-step 1: Reconnect the negative terminal of the battery.
Sub-step 2: Use the OBD-II scanner to clear the P0135 code from the vehicle's computer.