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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative terminal of the battery to ensure safety while working on electrical components.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector from cylinder two.
• Remove the ignition coil by unscrewing its mounting bolts and lifting it out.
• Use the spark plug socket to remove the spark plug from cylinder two.
• Inspect and replace the spark plug with a new one according to OEM specifications (check gap size).
• Reinstall the spark plug and torque it to the manufacturer’s specification (typically around 13-15 lb-ft).

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil shows signs of damage, replace it.
• Reinstall the new ignition coil onto the spark plug, ensuring it is seated correctly.
• Reconnect the ignition coil connector.

4. Check Fuel Injector

• If the spark plug and ignition coil are functioning correctly, inspect the fuel injector for cylinder two.
• Remove the fuel injector connector and unbolt the fuel rail if necessary.
• Test the injector for proper operation using a multimeter or replace if malfunctioning.

5. Reassemble Components

• Reinstall any removed components such as the engine cover.
• Reconnect the negative terminal of the battery.