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

Solution

1. Preparation

• Gather the necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Raise the vehicle if needed for easier access to components.

2. Replace Spark Plug

• Remove the engine cover (if applicable).
• Use a spark plug socket to remove the spark plug from cylinder 1.
• Inspect the old spark plug and compare it to the specifications for the new plug.
• Apply a small amount of anti-seize lubricant to the threads of the new spark plug.
• Torque the new spark plug to the manufacturer’s specifications (typically around 20-25 Nm).
• Reinstall the engine cover.

3. Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil on cylinder 1.
• Remove the mounting bolts securing the ignition coil.
• Pull the ignition coil out of the spark plug well.
• Install the new ignition coil and secure it with the bolts.
• Reconnect the electrical connector.

4. Test Fuel Injector

• Disconnect the fuel injector connector for cylinder 1.
• Use a multimeter to test the resistance of the injector (should be within the manufacturer’s specified range).
• If the injector is faulty, remove it and replace it with a new one.
• Reconnect the injector connector after installation.

5. Perform Compression Test (if necessary)

• Remove the spark plug from cylinder 1 again.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare the reading to factory specifications; if low, further diagnosis is needed for internal engine issues.