FAULTBASE
Error CodesASKCars
© 2026 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
How do I troubleshoot the check engine light on my 2020 Toyota Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/How do I troubleshoot the check engine light on my 2020 Toyota Highlander?

How do I troubleshoot the check engine light on my 2020 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
2-4 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
3 min read
599 words

Problem Statement

Step-by-step guide to troubleshoot the Check Engine Light on a 2020 Toyota Highlander, including symptoms, diagnostic steps, and tools required.

Affected Component
Engine Control System
Estimated Time
2-4 hours

Symptoms

  • •Illuminated Check Engine Light
  • •Engine performance issues
  • •Increased fuel consumption
  • •Unusual noises
  • •Exhaust smoke

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9

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
  • •Torque Wrench
  • •Basic Socket Set
  • •Multimeter
  • •Shop Manual or Repair Guide
  • •Safety Goggles and Gloves

Additional Information

Affected Component
Engine Control System
Estimated Time
2-4 hours
Difficulty
medium
Severity
medium
Tools Required
6 items

Related Faults

Loading...

Share this solution

Comments

Sign in to share your thoughts

Sign In

No comments yet

Be the first to share your thoughts

Back to Generation
Troubleshooting the Check Engine Light on a 2020 Toyota Highlander

The Check Engine Light (CEL) can be triggered by various issues in your 2020 Toyota Highlander. Below is a detailed, step-by-step guide on how to troubleshoot the CEL.

Tools Required
  • OBD-II Scanner: To read trouble codes.
  • Torque Wrench: For any bolts that may need to be tightened.
  • Basic Socket Set: For various fasteners.
  • Multimeter: For electrical diagnostics.
  • Shop Manual or Repair Guide: For specific specifications and procedures.
  • Safety Goggles and Gloves: For personal protection.
Repair Instructions

  1. Addressing Common Issues:

    • Replacing Fuel Injectors:

      • Disconnect the battery.
      • Remove the intake manifold if necessary to access injectors.
      • Replace faulty injectors, ensuring proper seating and alignment.
      • Reassemble and reconnect the battery.

    • Replacing Spark Plugs/Ignition Coils:

      • Remove the engine cover if applicable.
      • Disconnect the electrical connectors from the coils.
      • Remove the coils and plugs using a socket wrench.
      • Install new spark plugs and coils, ensuring they are properly torqued.

    • Repairing Exhaust Leaks:

      • Inspect exhaust gaskets, pipes, and connections.
      • Replace any damaged gaskets or sections of the pipe as needed.

  2. Final Steps

    • After repairs, reconnect the battery and clear any diagnostic codes.
    • Perform a final test drive to ensure the issue is resolved and the CEL remains off.

Conclusion

If the Check Engine Light persists after following these troubleshooting steps, it may be necessary to consult a professional technician for a more thorough diagnosis. Advanced issues such as problems with the Engine Control Module (ECM) or complex system failures may require specialized equipment and expertise.