FAULTBASE
Error CodesASKCars
© 2026 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
how to fix P0302 misfire code on my Toyota Highlander Fourth Generation (2020-present) - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/how to fix P0302 misfire code on my Toyota Highlander Fourth Generation (2020-present)

how to fix P0302 misfire code on my Toyota Highlander Fourth Generation (2020-present)

Toyota Highlander Fourth Generation (2020-present)

Error Codes
2-4 hours
Time
medium
Difficulty
high
Severity
Error Code: P0302
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
3 min read
593 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix P0302 cylinder 2 misfire in Toyota Highlander. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0302
Affected Component
Engine
Estimated Time
2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

  • •Disconnect battery before working on electrical systems.
  • •Allow engine to cool before opening engine components.

Symptoms

  • •Check engine light illuminated
  • •Rough idle or engine shaking
  • •Decreased engine power or acceleration
  • •Poor fuel economy
  • •Increased emissions

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
  • •Socket set
  • •Torque wrench
  • •Spark plug socket
  • •Multimeter
  • •Compression gauge

Parts Required

  • •Spark plug for cylinder 2
  • •Ignition coil (if found faulty)
  • •Fuel injector (if found faulty)

Additional Information

Error Code
P0302
Affected Component
Engine
Estimated Time
2-4 hours
Difficulty
medium
Severity
high
Tools Required
6 items
Parts Required
3 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
Solution
1. Preparation
  • Gather all necessary tools and parts.
  • Ensure the vehicle is in a safe, level area.
  • Disconnect the negative battery terminal to prevent electrical shorts.
2. Inspect and Replace Spark Plug
  • Tools Required: Socket set, torque wrench, gap gauge
  • Remove the ignition coil covering (if applicable).
  • Disconnect the electrical connector from the ignition coil.
  • Remove the ignition coil from cylinder 2 using a socket.
  • Remove the spark plug using a spark plug socket.
  • Inspect the spark plug for wear, carbon buildup, or damage; replace if necessary.
  • Install the new spark plug, ensuring it is gapped correctly (typically around 0.044 inches for most Toyota engines).
  • Torque the spark plug to manufacturer's specifications (usually around 13 lb-ft).
  • Reinstall the ignition coil and reconnect the electrical connector.
3. Inspect and Replace Ignition Coil (if necessary)
  • If the spark plug is fine, check the ignition coil for continuity and resistance using a multimeter.
  • If faulty, replace the ignition coil with a new one.
  • Reinstall the ignition coil and reconnect the electrical connector.
4. Inspect and Replace Fuel Injector (if necessary)
  • If the ignition coil is functioning properly, check the fuel injector for cylinder 2.
  • Disconnect the fuel line (use caution and follow safety procedures).
  • Remove the fuel injector and inspect for clogs or damage; clean or replace if necessary.
  • Reinstall the fuel injector ensuring it is seated properly and reconnect the fuel line.
5. Perform a Compression Test (if misfire persists)
  • Remove the spark plug from cylinder 2 and install a compression gauge.
  • Crank the engine several times to get a compression reading.
  • Compare the reading to the specifications (usually around 180 psi for a healthy engine).
  • If compression is low, further engine diagnostics may be needed.