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my Honda Civic 10th Generation (2016-2021) has a P0138 code what does this mean - Honda Civic
Home/Cars/Honda/Civic/10th Generation (2016-2021)/my Honda Civic 10th Generation (2016-2021) has a P0138 code what does this mean

my Honda Civic 10th Generation (2016-2021) has a P0138 code what does this mean

Honda Civic 10th Generation (2016-2021)

Error Codes
1-2 hours
Time
medium
Difficulty
medium
Severity
Error Code: P0138
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ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
3 min read
516 words

Problem Statement

Learn how to diagnose and fix P0138 oxygen sensor circuit issue in Honda Civic 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 battery before working on electrical systems.
  • •Allow engine to cool before opening exhaust components.

Symptoms

  • •Check engine light illuminated
  • •Poor fuel economy
  • •Increased emissions
  • •Rough idle or stalling
  • •Decreased engine performance

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5

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
  • •Oxygen sensor socket or wrench
  • •Multimeter
  • •Torque wrench

Parts Required

  • •New upstream oxygen sensor
  • •Anti-seize compound (if applicable)

Additional Information

Error Code
P0138
Affected Component
Exhaust System
Estimated Time
1-2 hours
Difficulty
medium
Severity
medium
Tools Required
4 items
Parts Required
2 items

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Solution
1. Preparation
  • Gather necessary tools and parts.
  • Disconnect the negative battery terminal to prevent electrical shorts.
  • Allow the engine to cool down before beginning work.
2. Inspect and Replace Oxygen Sensor

  1. Locate the Oxygen Sensor:

    • Find the upstream oxygen sensor (usually located in the exhaust manifold).

  2. Remove the Oxygen Sensor:

    • Use an oxygen sensor socket or wrench to carefully unscrew the sensor from the exhaust system.
    • Be cautious of hot surfaces if the engine was recently running.

  3. Inspect the Sensor and Wiring:

    • Check the sensor for any signs of damage or wear.
    • Inspect the wiring harness connected to the sensor for fraying or corrosion.

  4. Install the New Oxygen Sensor:

    • Apply anti-seize compound to the threads of the new oxygen sensor (if applicable).
    • Thread the new sensor into the exhaust system and tighten it to the manufacturer’s specifications (typically around 30 lb-ft).

  5. Reconnect the Wiring:

    • Plug in the electrical connector to the new oxygen sensor ensuring a snug fit.
3. Clear Codes and Test Drive

  1. Reconnect Battery Terminal:

    • Reattach the negative battery terminal and ensure it is secure.

  2. Clear the Trouble Codes:

    • Use the OBD-II scanner to erase the P0138 code from the vehicle’s computer.

  3. Test Drive the Vehicle:

    • Drive the vehicle for at least 20 minutes to allow the engine to reach operating temperature and monitor for any reoccurring codes.