how to fix the P0301 misfire code on my Volkswagen Passat B8 (2015-2022)?

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the battery to ensure safety.
• Allow the engine to cool before starting any work.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the engine cover (if applicable).
• Disconnect the electrical connectors from the ignition coil for cylinder 1.
• Unscrew and remove the ignition coil from cylinder 1.
• Check the spark plug for wear or damage. If worn, unscrew the spark plug and replace it with a new one (use OEM specifications).
• Apply a small amount of dielectric grease to the ignition coil connector.
• Reinstall the ignition coil and secure it with the screws.

3. Check and Clean or Replace Fuel Injector

• Tools Required: Fuel injector cleaning kit or replacement injector.
• Disconnect the fuel injector connector.
• Remove the fuel injector using an appropriate socket.
• Inspect the injector for clogs; clean it using a fuel injector cleaning kit or replace it if necessary.
• Reinstall the fuel injector and reconnect the electrical connector.

4. Verify Compression (if necessary)

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine to measure compression. It should be within manufacturer specifications.
• If compression is low, further investigation is required for internal engine issues.

5. Reassemble and Test

• Reinstall any components removed (engine cover, etc.).
• Reconnect the battery.
• Start the engine and monitor for any check engine light or rough idle.