how to fix P0300 code on Porsche Cayenne E3 (2018-Present) when it misfires?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool down before beginning work.

2. Replace Spark Plugs

1. Remove the engine cover if applicable.
2. Using a socket wrench, remove the spark plug wires or ignition coils to access the spark plugs.
3. Remove the old spark plugs using a spark plug socket.
4. Inspect the old spark plugs for fouling or wear.
5. Install new spark plugs with a torque setting of 15 lb-ft (20 Nm).
6. Reconnect the ignition coils or spark plug wires.

3. Test/Replace Ignition Coils

1. Remove the ignition coils from the affected cylinders.
2. Use a multimeter to test the resistance of the ignition coils; compare with manufacturer specifications.
3. If coils are faulty, replace them with new units.
4. Reinstall ignition coils and ensure they are securely connected.

4. Inspect and Clean Fuel Injectors

1. Remove the fuel injector connectors.
2. Use a fuel injector cleaning kit to clean the injectors, or replace them if they are clogged.
3. Reinstall the cleaned or new injectors and reconnect the electrical connectors.

5. Check for Vacuum Leaks

1. Visually inspect all vacuum hoses for cracks or disconnections.
2. Use a smoke machine or carburetor cleaner to identify leaks around the intake manifold and vacuum lines.
3. Replace any damaged hoses and ensure all connections are secure.