my Toyota Highlander XU70 (2020-Present) has a P0302 code, what does this mean?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, fuel pressure gauge, compression tester.
• Safety Warnings: Disconnect the battery before working on electrical systems.

2. Replace Spark Plug and Ignition Coil

1. Remove the engine cover (if applicable) to access the ignition coil.
2. Disconnect the electrical connector from the ignition coil on cylinder 2.
3. Remove the bolts securing the ignition coil using a socket set.
4. Carefully pull the ignition coil out of the spark plug well.
5. Remove the spark plug using a spark plug socket and inspect for wear or damage.
6. Install the new spark plug and torque it to the manufacturer’s specification (usually around 13-15 lb-ft).
7. Install the new ignition coil, ensuring that it is seated properly, and torque it to the specified value (typically 7-9 lb-ft).
8. Reconnect the electrical connector.

3. Test and Replace Fuel Injector (if necessary)

1. Perform a fuel injector balance test to determine the injector’s performance.
2. If the injector is found faulty, disconnect the fuel line and the electrical connector from the fuel injector.
3. Remove the old fuel injector from the fuel rail using a socket or pliers.
4. Install the new injector, ensuring proper seating and orientation.
5. Reconnect the fuel line and electrical connector.

4. Verify Engine Compression (if misfire persists)

1. Remove the spark plug from cylinder 2.
2. Insert a compression tester into the spark plug hole and crank the engine.
3. Note the compression reading and compare it to the manufacturer's specifications.
4. If compression is low, further investigation is needed (valve issues, head gasket failure, etc.).