how to fix the P0302 misfire code on my Toyota RAV4 XA40 (2013-2018)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, fuel injector cleaner.
• Ensure the vehicle is parked on a flat surface, and the engine is turned off and cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

1. Remove the engine cover if necessary to access the spark plugs.
2. Using a socket set, carefully remove the spark plug from cylinder 2.
3. Inspect the spark plug for damage; replace if fouled or worn (replace with OEM recommended spark plug).
4. Gap the new spark plug according to manufacturer specifications (typically between 0.043-0.047 inches).
5. Reinstall the spark plug and torque it to the manufacturer’s specified torque (usually around 13 lb-ft).
6. Reconnect the engine cover if removed.

3. Inspect and Replace Ignition Coil

1. Disconnect the electrical connector from the ignition coil on cylinder 2.
2. Remove the ignition coil using a socket set.
3. Inspect the coil for cracks or carbon tracking; replace if damaged.
4. Install the new ignition coil onto cylinder 2, ensuring it is seated properly.
5. Reconnect the electrical connector securely.

4. Test and Clean Fuel Injector

1. Disconnect the fuel injector connector on cylinder 2.
2. Use a multimeter to check the injector's resistance; it should be within specifications (usually 12-16 ohms).
3. If the injector is faulty, replace it with a new one.
4. If functional, clean the injector using a fuel injector cleaner or an ultrasonic cleaner if available.
5. Reconnect the fuel injector connector securely.

5. Reconnect Battery and Clear Codes

1. Reconnect the negative battery terminal.
2. Use the OBD-II scanner to clear the P0302 code from the ECU.
3. Start the engine and allow it to idle for a few minutes.