FAULTBASE
Error CodesASKCars
© 2026 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
What are the common engine warning codes for a 2022 Toyota Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/What are the common engine warning codes for a 2022 Toyota Highlander?

What are the common engine warning codes for a 2022 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
648 words

Problem Statement

Explore common engine warning codes for the 2022 Toyota Highlander, including symptoms, diagnostic steps, and tools required for repairs.

Affected Component
Engine

Symptoms

  • •Check Engine Light (CEL) illuminated
  • •Possible decrease in fuel economy
  • •Rough idle or reduced engine performance
  • •Engine hesitation
  • •Decreased fuel efficiency
  • •Possible fuel odor
  • •Engine takes longer to heat up
  • •Potential overheating issues

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11
  12. 12
  13. 13

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
  • •Exhaust gas analyzer (if available)
  • •Spark plug socket
  • •Torque wrench
  • •Fuel pressure gauge
  • •Vacuum gauge
  • •MAF sensor cleaner
  • •Smoke machine
  • •Basic hand tools
  • •Infrared thermometer

Additional Information

Affected Component
Engine
Difficulty
medium
Severity
medium
Tools Required
11 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
Common Engine Warning Codes for a 2022 Toyota Highlander

The 2022 Toyota Highlander is equipped with an advanced On-Board Diagnostics II (OBD-II) system that can generate various trouble codes when it detects issues. Below are some common engine warning codes, their symptoms, diagnostic steps, and potential repairs.

Common Codes:

  1. P0420 - Catalyst System Efficiency Below Threshold (Bank 1)

    • Symptoms:
      • Check Engine Light (CEL) illuminated.
      • Possible decrease in fuel economy.
      • Rough idle or reduced engine performance.
    • Diagnostic Steps:
      1. Use an OBD-II scanner to confirm the code.
      2. Inspect the exhaust system for leaks or damage.
      3. Check the condition of the catalytic converter.
      4. Monitor the oxygen sensors' readings.
    • Tools Required:
      • OBD-II scanner
      • Multimeter
      • Exhaust gas analyzer (if available)
    • Repair Instructions:
      1. If the catalytic converter is damaged, replace it.
      2. If the oxygen sensors are faulty, replace them.
      3. Repair any exhaust leaks found during the inspection.

  2. P0300 - Random/Multiple Cylinder Misfire Detected

    • Symptoms:
      • Rough engine idle.
      • Engine hesitation.
      • Decreased fuel efficiency.
    • Diagnostic Steps:
      1. Use an OBD-II scanner to confirm the code.
      2. Check for other related misfire codes (P0301-P0306).
      3. Inspect spark plugs and ignition coils.
      4. Check fuel injectors for proper operation.
    • Tools Required:
      • OBD-II scanner
      • Spark plug socket
      • Torque wrench
      • Fuel pressure gauge
    • Repair Instructions:
      1. Replace any faulty spark plugs or ignition coils.
      2. Clean or replace fuel injectors if they are clogged.
      3. Perform a compression test to rule out mechanical issues.

  3. P0171 - System Too Lean (Bank 1)

    • Symptoms:
      • Check Engine Light illuminated.
      • Engine may run rough or hesitate.
      • Possible decrease in performance.
    • Diagnostic Steps:
      1. Confirm the code with an OBD-II scanner.
      2. Inspect the intake system for vacuum leaks.
      3. Check the mass air flow (MAF) sensor operation.
    • Tools Required:
      • OBD-II scanner
      • Vacuum gauge
      • MAF sensor cleaner
    • Repair Instructions:
      1. Repair any vacuum leaks found in the intake system.
      2. Clean or replace the MAF sensor if necessary.
      3. Ensure the fuel system is operating correctly and consider fuel pressure checks.

  4. P0455 - Evaporative Emission Control System Leak Detected (Large Leak)

    • Symptoms:
      • Illuminated Check Engine Light.
      • Possible fuel odor.
      • Poor fuel economy.
    • Diagnostic Steps:
      1. Use an OBD-II scanner to check for the code.
      2. Perform a visual inspection of the EVAP system components.
      3. Use a smoke machine to detect leaks in the EVAP system.
    • Tools Required:
      • OBD-II scanner
      • Smoke machine
      • Basic hand tools
    • Repair Instructions:
      1. Repair or replace any damaged EVAP hoses or components.
      2. Replace the gas cap if it’s faulty or does not seal properly.
      3. Clear the code and test drive the vehicle to ensure the problem is resolved.

  5. P0128 - Coolant Temperature Below Thermostat Regulating Temperature

    • Symptoms:
      • Check Engine Light illuminated.
      • Engine takes longer to heat up.
      • Potential overheating issues.
    • Diagnostic Steps:
      1. Confirm the code with an OBD-II scanner.
      2. Check the engine coolant level.
      3. Test the thermostat operation (should open at specified temperature).
    • Tools Required:
      • OBD-II scanner
      • Infrared thermometer
      • Basic hand tools
    • Repair Instructions:
      1. Replace the thermostat if it is stuck open or defective.
      2. Ensure proper coolant levels and inspect for leaks.
      3. Clear the code and monitor the engine temperature during operation.
Conclusion

These are some of the common engine warning codes you may encounter with a 2022 Toyota Highlander. Each code requires specific diagnostic steps and tools to effectively troubleshoot and repair the underlying issues. Always refer to the vehicle’s repair manual for specific instructions and torque specifications when performing repairs. If you are unsure about any step, consult a professional automotive technician for assistance.