how to resolve P0302 engine misfire code in Toyota Highlander Third Generation (2014-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical short circuits.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil from cylinder 2.
• Using the spark plug socket, remove the spark plug from cylinder 2.
• Inspect the spark plug for wear or damage (carbon buildup, cracks).
• If necessary, replace the spark plug with the specified type (refer to the owner’s manual).
• Torque the new spark plug to the manufacturer’s specification (typically around 13 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set.
• If the spark plug is in good condition, proceed to inspect the ignition coil.
• Remove the ignition coil from cylinder 2.
• Test the ignition coil using a multimeter for proper resistance.
• If faulty, replace with a new ignition coil.
• Reinstall the ignition coil and ensure it is secured properly.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit or replacement injector.
• Remove the fuel rail to access the injector for cylinder 2.
• Inspect the fuel injector for clogs or leaks.
• If necessary, clean the injector using a cleaning kit or replace it with a new one.
• Reassemble the fuel rail ensuring all connections are tight.

5. Compression Test

• Tools Required: Compression tester.
• Insert the compression tester into the spark plug hole of cylinder 2.
• Crank the engine to take the reading.
• Compare the reading with manufacturer specifications (typically around 180-200 psi).
• If compression is low, further investigation into internal engine issues may be required.