my Volkswagen Passat B8 (2015-2022) has a P0301 code what's the fix

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector on cylinder 1.
• Remove the ignition coil by unscrewing it from the cylinder head.
• Inspect the spark plug for wear or damage; if needed, remove using a spark plug socket.
• Replace the spark plug with a new OEM or equivalent part, ensuring to gap it according to specifications (typically around 0.028-0.032 inches).
• Install the new ignition coil and reconnect the electrical connector, ensuring a snug fit.

3. Check and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit or fuel system cleaner.
• If the injector is accessible, remove it from the fuel rail.
• Inspect for dirt or carbon deposits; clean using a fuel injector cleaning kit.
• Reinstall the fuel injector, ensuring proper seating and connection.

4. Compression Testing

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine to take a reading; compare with manufacturer specifications (typically 150-200 psi).
• If compression is low, further investigation into internal engine components may be required.

5. Check for Vacuum Leaks

• Inspect all vacuum lines leading to and from the intake manifold.
• Use a smoke machine or carburetor cleaner around the manifold to identify any leaks.
• Repair or replace any damaged hoses or gaskets found.