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Home/Cars/Honda/Civic/10th Generation (2016-2021)/how to troubleshoot my Honda Civic 10th Generation (2016-2021) that has a P0138 code

how to troubleshoot my Honda Civic 10th Generation (2016-2021) that has a P0138 code

Honda Civic 10th Generation (2016-2021)

Severity: mediumDifficulty: mediumError Code: P01381-3 hours
3 min read
509 words

Problem Statement

Learn how to troubleshoot and fix P0138 high voltage issue in Honda Civic 10th Generation. Step-by-step guide with diagnostic and repair instructions.

Error Code
P0138
Component
Exhaust System
Repair Time
1-3 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow the engine to cool before working on the exhaust system.

Symptoms

  • •Check engine light illuminated
  • •Poor fuel economy
  • •Engine stalling or hesitation during acceleration
  • •Rough idle
  • •Increased emissions

Diagnostic Steps

  1. 1Scan the vehicle using an OBD-II scanner to confirm the P0138 code and check for any additional codes that may be present.
  2. 2Inspect the oxygen sensor wiring and connectors for any signs of damage, corrosion, or loose connections.
  3. 3Measure the voltage output of the upstream oxygen sensor with a multimeter while the engine is running.
  4. 4Check the engine's fuel trim readings using the OBD-II scanner to determine if they are outside normal parameters.
  5. 5Verify the vehicle’s ground connections and battery voltage to ensure the electrical system is functioning properly.
  6. 6Inspect the exhaust system for leaks, which could affect the oxygen sensor's readings.

Solution

Solution

1. Preparation

  • Gather tools and parts required for the repair.
  • Ensure the vehicle is parked on a flat surface and the engine is cool.
  • Disconnect the negative battery terminal for safety.

2. Inspect and Repair Wiring

  • Remove the engine cover if necessary to gain access to the harness.
  • Visually inspect the wiring and connectors of the upstream oxygen sensor.
  • If damaged, repair or replace any faulty wiring or connectors.

3. Replace the Upstream Oxygen Sensor

  • Locate the upstream oxygen sensor (typically near the exhaust manifold).
  • Use an O2 sensor socket to remove the old sensor by turning it counter-clockwise.
  • Apply anti-seize compound to the threads of the new sensor (if recommended).
  • Install the new oxygen sensor by threading it in clockwise and tightening it to the manufacturer’s specifications (typically 30-40 ft-lbs).
  • Reconnect the electrical connector to the oxygen sensor.

4. Clear the Error Codes

  • Reconnect the negative battery terminal.
  • Use the OBD-II scanner to clear the P0138 code from the vehicle’s computer.

5. Test Drive

  • Start the engine and allow it to idle for a few minutes.
  • Take the vehicle for a test drive, monitoring for any check engine light illumination.

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
  • Wrench set
  • Torque wrench

Parts Required

  • Upstream oxygen sensor (specific to Honda Civic 10th Generation)

Additional Information

Error CodeP0138
Component

Exhaust System

Repair Time

1-3 hours

Difficulty

medium

Severity

medium

Tools

5 items

Parts

1 items

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