how to fix the P0302 misfire code on my Toyota Highlander Third Generation (2014-2019)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative terminal of the battery to prevent electrical shorts.
• Allow the engine to cool before starting the repair.

2. Replace Spark Plug and Ignition Coil

1. Remove Engine Cover (if applicable)

   • Use a socket set to remove any bolts securing the engine cover.
   • Set the cover aside.

2. Access Spark Plug and Ignition Coil

   • Locate the ignition coil for cylinder 2 (refer to the engine layout).
   • Disconnect the electrical connector from the ignition coil.

3. Remove Ignition Coil

   • Use a socket to remove the bolt securing the ignition coil.
   • Gently pull the ignition coil out of the cylinder head.

4. Replace Spark Plug

   • Use a spark plug socket to remove the old spark plug.
   • Inspect the new spark plug and ensure it is gapped correctly for your vehicle specifications (typically around 0.043 inches for many Toyota engines).
   • Install the new spark plug and torque it to the manufacturer's specification (usually around 13-16 lb-ft).

5. Install New Ignition Coil

   • Insert the new ignition coil into the spark plug hole.
   • Secure it with the bolt and reconnect the electrical connector.

3. Reassemble and Test

• Reinstall the engine cover if it was removed.
• Reconnect the negative battery terminal.
• Start the engine and allow it to idle.