how can I fix a P0135 code in Honda Pilot Third Generation (2016-present)

Honda Pilot Third Generation (2016-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0135

3 min read

546 words

Problem Statement

Learn how to diagnose and fix P0135 oxygen sensor circuit issues in Honda Pilot (2016-present). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0135

Affected Component

Exhaust System

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 working on exhaust components.

Symptoms

•Check engine light illuminated
•Poor fuel economy
•Engine roughness during idle
•Failure to pass emissions test
•Increased exhaust emissions
•Lack of power during acceleration

Diagnostic Steps

1
Scan the vehicle's computer with an OBD-II scanner to confirm the P0135 code and check for any related codes.
2
Inspect the wiring and connectors of the upstream oxygen sensor for any visible damage, fraying, or corrosion.
3
Measure the voltage output of the oxygen sensor using a multimeter while the engine is running.
4
Check the vehicle's powertrain control module (PCM) for any software updates or reprogramming needs.
5
Inspect the fuse associated with the oxygen sensor circuit for continuity and replace if necessary.
6
Test the ground connection for the oxygen sensor to ensure proper grounding.

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 brush

Parts Required

•Upstream oxygen sensor (specific to Honda Pilot 2016-present)

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Diagnostic Steps

1
Scan the vehicle's computer with an OBD-II scanner to confirm the P0135 code and check for any related codes.
2
Inspect the wiring and connectors of the upstream oxygen sensor for any visible damage, fraying, or corrosion.
3
Measure the voltage output of the oxygen sensor using a multimeter while the engine is running.
4
Check the vehicle's powertrain control module (PCM) for any software updates or reprogramming needs.
5
Inspect the fuse associated with the oxygen sensor circuit for continuity and replace if necessary.
6
Test the ground connection for the oxygen sensor to ensure proper grounding.

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, wire brush.
Safety Warnings: Disconnect the battery before working on electrical systems. Allow the engine to cool before working on exhaust components.

2. Inspect and Repair Wiring

Step 1: Ensure the vehicle is securely lifted and supported if accessing the underside.
Step 2: Visually inspect the oxygen sensor wiring and connectors for any signs of wear, damage, or corrosion.
Step 3: Clean any corroded connectors with electrical contact cleaner and a wire brush.
Step 4: If damage is found, repair the wiring using heat-shrink tubing and solder connections or replace the wiring harness as needed.

3. Replace the Oxygen Sensor

Step 1: Locate the upstream oxygen sensor (usually near the exhaust manifold).
Step 2: Use a socket set to carefully remove the oxygen sensor from the exhaust system.
Step 3: Install the new oxygen sensor by threading it into the exhaust pipe and tightening it to the manufacturer's specifications (usually around 30-35 lb-ft).
Step 4: Reconnect the electrical connector ensuring it clicks into place.

4. Reset the Engine Control Module (ECM)

Step 1: Reconnect the battery terminals securely.
Step 2: Use the OBD-II scanner to clear the stored codes in the ECM.
Step 3: Start the engine and allow it to idle for a few minutes to let the system recalibrate.