FAULTBASE
Error CodesASKCars
© 2026 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
my Toyota Highlander XU70 (2020-Present) has a P0301 code, how do I fix it - Toyota Highlander
Home/Cars/Toyota/Highlander/XU70 (2020-Present)/my Toyota Highlander XU70 (2020-Present) has a P0301 code, how do I fix it

my Toyota Highlander XU70 (2020-Present) has a P0301 code, how do I fix it

Toyota Highlander XU70 (2020-Present)

Error Codes
2-4 hours
Time
medium
Difficulty
high
Severity
Error Code: P0301
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
3 min read
578 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 P0301 cylinder 1 misfire in Toyota Highlander XU70. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0301
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 any components.

Symptoms

  • •Check engine light illuminated
  • •Rough idle when the engine is running
  • •Decreased engine performance or power loss
  • •Increased fuel consumption
  • •Possible engine stalling or hesitation during acceleration

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6

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

Parts Required

  • •Spark plug (specific to engine type)
  • •Ignition coil (if faulty)
  • •Fuel injector (if faulty)

Additional Information

Error Code
P0301
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 necessary tools and parts.
  • Disconnect the negative battery terminal to prevent electrical shorts.
  • Ensure the engine is cool to avoid burns.
2. Inspect and Replace Spark Plug
  • Remove the ignition coil for cylinder 1:
    • Unplug the electrical connector.
    • Remove the mounting bolts using a socket set.
  • Extract the spark plug using a spark plug socket:
    • Inspect for signs of wear, such as carbon buildup or damage.
    • Replace with a new spark plug if necessary, ensuring proper gap (usually 0.043 inches for most Toyota models).
    • Torque the new spark plug to the manufacturer's specification (typically 13 ft-lbs).
3. Check and Replace Ignition Coil
  • If the spark plug is in good condition, inspect the ignition coil:
    • Use a multimeter to measure the resistance of the ignition coil.
    • If out of specification, replace the ignition coil with a new one.
  • Reinstall the ignition coil and reconnect the electrical connector.
4. Test Fuel Injector Operation
  • Remove the fuel injector connector for cylinder 1.
  • Use a noid light or multimeter to check for signals to the injector.
  • If there’s no signal, further investigate wiring or ECU issues.
  • If the injector is faulty, replace it with a new one, ensuring proper seating and connection.
5. Compression Test
  • If misfire persists, conduct a compression test on cylinder 1:
    • Remove the spark plug and connect a compression gauge.
    • Crank the engine for a few seconds to obtain a reading.
    • Compare the results with specifications (usually around 150-200 psi).
  • If compression is low, further engine diagnostics may be necessary.