my Toyota Highlander XU70 (2020-Present) has a P0302 misfire code, what does it mean?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety while working on the ignition system.

2. Inspect and Replace Ignition Components

• Remove Ignition Coil:

  1. Unplug the electrical connector from the ignition coil on cylinder two.
  2. Remove the mounting bolts using a socket set.
  3. Carefully pull the ignition coil out of the spark plug well.

• Inspect Spark Plug:

  1. Remove the spark plug using a spark plug socket.
  2. Inspect for signs of wear, fouling, or damage.
  3. Replace with a new spark plug if necessary (check manufacturer's specifications for gap).

• Reinstall Ignition Coil:

  1. Place the ignition coil back into the spark plug well.
  2. Secure with mounting bolts and reconnect the electrical connector.

3. Check and Replace Fuel Injector

• Test Fuel Injector:

  1. Using a noid light, connect it to the fuel injector harness for cylinder two to check for proper pulsing.
  2. If no signal, inspect wiring and connectors for damage.

• Remove and Replace Fuel Injector:

  1. Disconnect the fuel line and relieve fuel pressure.
  2. Remove the fuel rail if necessary to access the injector.
  3. Remove the old fuel injector and replace it with a new one, ensuring proper sealing.

4. Compression Test

• Conduct Compression Test:
  1. Remove the spark plug from cylinder two.
  2. Insert a compression gauge into the spark plug hole.
  3. Crank the engine and record the compression reading. Compare to specifications.

5. Final Checks and Reassembly

• Reinstall any components removed during the process.
• Reconnect the negative battery terminal.
• Start the engine and monitor for any abnormal sounds or check engine light.