how to fix P0302 code on Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Park the vehicle on a flat surface and engage the parking brake.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2:
  • Unplug the electrical connector.
  • Remove the mounting bolts using a socket set.
• Extract the spark plug with a spark plug socket:
  • Inspect for wear, carbon buildup, or damage.
  • Replace with a new spark plug if necessary (use OEM specifications).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test and Replace Ignition Coil (if required)

• If the spark plug is fine, test the ignition coil:
  • Use a multimeter to check the primary and secondary resistance.
• If out of specification, replace the ignition coil with a new one:
  • Install the new coil and reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Remove the fuel injector from cylinder 2:
  • Disconnect the fuel line (use caution due to fuel pressure).
  • Remove retaining clips and pull out the injector.
• Clean the injector using a fuel injector cleaner or replace if faulty.
• Reinstall the fuel injector ensuring proper sealing.

5. Compression Test

• Perform a compression test on cylinder 2:
  • Remove the spark plug.
  • Insert compression gauge and crank the engine.
  • Compare the reading to the manufacturer’s specifications.
• If low, investigate further for potential internal engine issues.

6. Reconnect and Test

• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.
• Monitor for engine performance and check for any recurring codes.