FAULTBASE
Error CodesASKCars
© 2026 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
What are the common engine issues reported by Toyota Highlander 2020 owners? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/What are the common engine issues reported by Toyota Highlander 2020 owners?

What are the common engine issues reported by Toyota Highlander 2020 owners?

Toyota Highlander Fourth Generation (2020-present)

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

Problem Statement

Explore the common engine issues reported by 2020 Toyota Highlander owners, including symptoms, diagnostic steps, and repair instructions.

Affected Component
engine

Symptoms

  • •Sudden loss of power while driving
  • •Engine shuts off at idle or during acceleration
  • •Warning lights on the dashboard may illuminate
  • •Unusual knocking or ticking sounds from the engine compartment
  • •Frequent need to add oil between oil changes
  • •Blue smoke from the exhaust during acceleration
  • •Engine vibrates or shakes while idling
  • •RPM fluctuates unexpectedly

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
  14. 14
  15. 15
  16. 16

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
  • •Fuel pressure gauge
  • •Multimeter
  • •Basic hand tools (screwdrivers, wrenches)
  • •Mechanic's stethoscope
  • •Oil pressure gauge
  • •Compression tester
  • •Oil catch pan
  • •Smoke machine or carb cleaner
  • •Spark plug socket

Additional Information

Affected Component
engine
Difficulty
medium
Severity
medium
Tools Required
10 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 Issues Reported by 2020 Toyota Highlander Owners

The 2020 Toyota Highlander, part of the fourth generation, has generally received positive reviews, but some owners have reported specific engine-related issues. Below are the common symptoms, diagnostic steps, and potential repairs for these issues.

1. Engine Stalling
Tools Required:
  • OBD-II scanner
  • Fuel pressure gauge
  • Multimeter
  • Basic hand tools (screwdrivers, wrenches)

Repair Instructions:

  1. If Trouble Codes Exist: Address the specific issue indicated by the codes (e.g., replace faulty sensors).
  2. Fuel System Repair: If the fuel pump is faulty, replace it; if the fuel filter is clogged, replace it.
  3. Clean Air Intake: Replace or clean air filter and inspect the throttle body for carbon buildup.
  4. Electrical Issues: Tighten or replace corroded battery terminals or repair any wiring issues identified.
2. Engine Noise (Knocking or Ticking)
Tools Required:
  • Mechanic's stethoscope
  • Oil pressure gauge
  • Basic hand tools

Repair Instructions:

  1. Oil Change: If oil is low or dirty, perform an oil change using the recommended oil type.
  2. Adjust Valves: If valve clearance is out of spec, adjust as necessary according to service manual specifications.
  3. Timing Chain Replacement: If the timing chain or tensioner is faulty, replace them as per the manufacturer’s guidelines.
3. Excessive Oil Consumption
Tools Required:
  • Compression tester
  • Oil catch pan
  • Basic hand tools

Repair Instructions:

  1. Top Off Oil: Add oil as needed and monitor consumption rate.
  2. Fix Leaks: Repair any leaks found, such as replacing gaskets or seals.
  3. Compression Repair: If low compression is found, investigate for worn piston rings or valve guides and replace as needed.
  4. PCV Valve Replacement: If the PCV valve is stuck open or clogged, replace it.
4. Rough Idling
Tools Required:
  • OBD-II scanner
  • Spark plug socket
  • Smoke machine or carb cleaner
  • Basic hand tools

Repair Instructions:

  1. Replace Spark Plugs: If worn or fouled, replace with OEM-equivalent plugs.
  2. Repair Vacuum Leaks: Replace any damaged hoses or gaskets found during inspection.
  3. Clean or Replace IAC Valve: If the IAC valve is malfunctioning, clean or replace it per service manual guidelines.
Conclusion

While the 2020 Toyota Highlander is a reliable vehicle, like any car, it can experience engine issues. Addressing these problems promptly can prevent further damage and maintain vehicle performance. Always refer to the manufacturer’s service manual for specific torque specifications and repair procedures. If issues persist, consider consulting with a certified automotive technician.