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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool completely.

2. Spark Plug Replacement

1. Remove the engine cover if applicable, using a socket set.
2. Locate cylinder 2 spark plug, typically near the front of the engine.
3. Using a spark plug socket, carefully unscrew and remove the old spark plug.
4. Inspect the old spark plug for signs of wear or damage.
5. Apply anti-seize compound to the threads of the new spark plug.
6. Install the new spark plug and tighten it to the manufacturer's specified torque (usually around 13-15 ft-lbs).
7. Reconnect the spark plug wire or ignition coil.

3. Ignition Coil Inspection/Replacement

1. If issues persist, remove the ignition coil from cylinder 2 by unscrewing it and pulling it off the spark plug.
2. Inspect the ignition coil for cracks or damage.
3. If necessary, replace the ignition coil with a new one and ensure proper seating on the spark plug.

4. Fuel Injector Testing/Replacement

1. Locate the fuel injector for cylinder 2.
2. Disconnect the electrical connector from the injector.
3. Using a multimeter, test for proper resistance according to specifications (usually around 12-16 ohms).
4. If the injector is faulty, remove it by unscrewing the retaining bolts and pulling it out of the fuel rail. Replace with a new injector.
5. Reconnect the fuel line and electrical connector.

5. Reassemble and Test

• Reattach any components or covers removed during the process.
• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.