how to fix P0138 code on Honda CR-V Fifth Generation (2017-2022)?

Honda CR-V 6th Gen (2023-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

Error Code: P0138

3 min read

477 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix P0138 O2 sensor high voltage issue in Honda CR-V (2017-2022). 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 engine to cool before working on exhaust components.

Symptoms

•Check engine light illuminated
•Poor fuel economy
•Rough idle
•Increased emissions
•Potential engine stalling

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0138 code.
2
Inspect the O2 sensor wiring and connector for any signs of damage or corrosion.
3
Check the O2 sensor voltage output using a multimeter while the engine is running.
4
Inspect the exhaust system for leaks or blockages that could affect sensor readings.
5
Verify the engine's fuel trim values; excessive positive trim may indicate an issue.
6
Test the O2 sensor for proper operation using a scan tool or multimeter.

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
•O2 sensor socket
•Multimeter
•Wrench set
•Anti-seize compound

Parts Required

•New O2 sensor (Bank 1 Sensor 2)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0138 code.
2
Inspect the O2 sensor wiring and connector for any signs of damage or corrosion.
3
Check the O2 sensor voltage output using a multimeter while the engine is running.
4
Inspect the exhaust system for leaks or blockages that could affect sensor readings.
5
Verify the engine's fuel trim values; excessive positive trim may indicate an issue.
6
Test the O2 sensor for proper operation using a scan tool or multimeter.

Solution

1. Preparation

Gather tools and parts required.
Ensure the vehicle is parked on a flat surface and the engine is cool.
Disconnect the battery to prevent any electrical shorts.

2. Remove the O2 Sensor

Locate the Bank 1 Sensor 2 O2 sensor (usually found on the exhaust after the catalytic converter).
Use an O2 sensor socket to carefully unscrew the sensor from the exhaust pipe.
Disconnect the electrical connector from the O2 sensor.

3. Inspect and Clean

Inspect the connector for corrosion or damage; clean if necessary.
Check the sensor threads for any debris or damage.

4. Install New O2 Sensor

Apply anti-seize compound to the threads of the new O2 sensor (if required).
Screw the new sensor into the exhaust pipe hand-tight, then use the O2 sensor socket to securely tighten it (typically 30-40 ft-lbs).
Reconnect the electrical connector ensuring it clicks into place.

5. Clear Codes and Test

Reconnect the battery.
Use an OBD-II scanner to clear the P0138 code.
Start the engine and allow it to reach operating temperature while monitoring the O2 sensor's performance with a scan tool.