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

Solution

1. Preparation

• Gather tools and components required for the repair.
• Disconnect the battery (negative terminal) to ensure safety during repairs.

2. Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench, dielectric grease.
• Remove the ignition coil from cylinder 2 by unscrewing the bolts and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear; replace with a new spark plug if necessary.
• Apply dielectric grease to the new spark plug threads and install it, tightening to the manufacturer's specified torque (usually around 13-15 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if needed)

• Tools Required: Socket set, torque wrench.
• If the ignition coil was found faulty during inspection, remove it as described in the previous step.
• Install the new ignition coil and secure it with bolts, tightening to the specified torque.

4. Clean or Replace Fuel Injector (if needed)

• Tools Required: Fuel injector cleaning kit or replacement fuel injector.
• Remove the fuel rail (if required) to access the fuel injector for cylinder 2.
• Inspect the fuel injector; clean it using a fuel injector cleaning kit or replace it with a new unit as necessary.
• Reassemble the fuel rail and ensure all connectors are secure.

5. Final Assembly

• Reconnect the battery.
• Start the engine and allow it to idle for a few minutes, checking for any unusual noises or issues.