how to fix P0303 misfire code in my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the battery to ensure safety during repair.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if necessary.
• Disconnect the ignition coil connector.
• Remove the ignition coil from cylinder 3.
• Unscrew the old spark plug using a spark plug socket.
• Install the new spark plug to the manufacturer's specified torque (typically 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 diagnostics, remove it as described above.
• Install a new ignition coil for cylinder 3.
• Secure it and reconnect the electrical connector.

4. Clean or Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector cleaner or new injectors, fuel line tools.
• Disconnect the fuel line and electrical connector from the injector.
• Remove the injector from the rail.
• Clean the injector using a cleaning kit or replace with a new one.
• Reinstall the injector and reconnect the fuel line and electrical connector.

5. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear the P0303 code.
• Start the engine to ensure the repair was successful.