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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the electrical connector from the ignition coil on cylinder 2.
  3. Remove the ignition coil by unscrewing the retaining bolts.
  4. Pull out the spark plug using the spark plug socket.
  5. Inspect the old spark plug for signs of wear or fouling. Replace it with a new spark plug, torquing it to the manufacturer's specifications (typically around 13-16 lb-ft).
  6. Apply dielectric grease to the ignition coil boot and reinstall the ignition coil, securing it with the retaining bolts.

3. Test Fuel Injector

• Tools Required: Noid light or multimeter.
• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 2.
  2. Use a noid light to check for pulse. If no pulse is detected, test the electrical connector with a multimeter to ensure it receives voltage.
  3. If the injector is faulty, replace it with a new one, ensuring proper seating and connection.

4. Perform Compression Test (if necessary)

• Tools Required: Compression gauge.
• Sub-steps:
  1. Remove the spark plug from cylinder 2.
  2. Insert the compression gauge into the spark plug hole.
  3. Crank the engine and record the compression reading.
  4. Compare the reading with the manufacturer’s specifications. If low, further diagnosis may be necessary for internal engine issues.