how to fix the P0138 code in my Honda Accord 10th Generation (2018-2022)

Honda Accord 8th Generation (2008-2012)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0138

3 min read

512 words

Problem Statement

Learn how to diagnose and fix P0138 high voltage from oxygen sensor in Honda Accord 10th Generation. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0138

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 touching any components.

Symptoms

•Check engine light illuminated
•Poor fuel economy
•Engine running rich
•Increased exhaust emissions
•Rough idle

Diagnostic Steps

1
Scan the vehicle's OBD-II system to confirm the P0138 code and check for any additional codes.
2
Inspect the wiring and connectors leading to the bank 1 sensor 2 for damage or corrosion.
3
Measure the voltage output from the oxygen sensor using a multimeter to confirm it exceeds the normal range (typically 0.1 to 0.9 volts).
4
Check the vehicle’s exhaust system for leaks that may affect sensor readings.
5
Verify the functionality of the engine control module (ECM) by checking for software updates or previous repairs that may influence sensor performance.

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
•Ratchet
•Torque wrench
•Wire strippers
•Electrical tape

Parts Required

•Bank 1 sensor 2 oxygen sensor
•Anti-seize compound

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Diagnostic Steps

1
Scan the vehicle's OBD-II system to confirm the P0138 code and check for any additional codes.
2
Inspect the wiring and connectors leading to the bank 1 sensor 2 for damage or corrosion.
3
Measure the voltage output from the oxygen sensor using a multimeter to confirm it exceeds the normal range (typically 0.1 to 0.9 volts).
4
Check the vehicle’s exhaust system for leaks that may affect sensor readings.
5
Verify the functionality of the engine control module (ECM) by checking for software updates or previous repairs that may influence sensor performance.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to ensure safety.
Raise the vehicle securely on jack stands if needed.

2. Inspect and Repair Wiring

Sub-steps:
- Remove any protective coverings over the wiring harness leading to the sensor.
- Visually inspect the wires for fraying, breaks, or corrosion.
- Repair or replace damaged wiring as necessary.
Tools Required: Wire strippers, electrical tape, heat shrink tubing.

3. Replace Oxygen Sensor

Sub-steps:
- Locate bank 1 sensor 2, which is usually positioned after the catalytic converter.
- Disconnect the sensor’s electrical connector.
- Use an oxygen sensor socket to remove the old sensor.
- Apply anti-seize compound to the threads of the new sensor before installation.
- Install the new sensor and reconnect the electrical connector.
Tools Required: Oxygen sensor socket, ratchet, torque wrench.
Torque Specifications: Typically 30-40 lb-ft for oxygen sensors (check specific vehicle manual).

4. Clear Codes and Test Drive

Sub-steps:
- Reconnect the battery.
- Use an OBD-II scanner to clear the P0138 code from the ECM.
- Test drive the vehicle for at least 20 minutes to ensure the code does not reappear.
Tools Required: OBD-II scanner.