how to fix P0301 misfire code in Volkswagen Passat B8 (2015-2022)?

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool if it has been running.

2. Inspect and Replace Spark Plug

• Remove the engine cover if applicable.
• Locate and remove the spark plug wire or coil pack from cylinder 1.
• Use a spark plug socket to remove the spark plug.
• Inspect the spark plug for fouling or wear; replace if necessary with OEM specifications (typically NGK or Bosch).
• Install the new spark plug and torque to manufacturer specifications (usually around 22 lb-ft).

3. Inspect and Replace Ignition Coil

• If the spark plug replacement does not resolve the issue, remove the ignition coil.
• Disconnect the electrical connector from the ignition coil.
• Remove the mounting screws and lift out the coil.
• Install a new ignition coil and reconnect the electrical connector.
• Ensure the coil is seated properly and reattach any screws.

4. Fuel Injector Testing and Replacement

• Use a fuel injector testing kit to check the operation of the injector for cylinder 1.
• If the injector is faulty, disconnect the fuel line and electrical connector.
• Remove the fuel injector using an appropriate tool.
• Install the new fuel injector and reconnect the fuel line and electrical connector.

5. Reassemble and Clear Codes

• Reinstall any removed components, including the engine cover.
• Reconnect the battery.
• Use an OBD-II scanner to clear the P0301 code from the vehicle’s computer.