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

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Remove the engine cover if applicable using a socket set.
• Disconnect the ignition coil connector and remove the ignition coil using a socket.
• Remove the spark plug using a spark plug socket and inspect it for wear or damage.
• If necessary, replace the spark plug with one that meets OEM specifications (typically NGK or Bosch).
• Reinstall the spark plug and tighten it to the manufacturer’s torque specification (usually around 25 Nm).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, inspect the ignition coil. If it shows signs of wear or damage, replace it.
• Install the new ignition coil and reconnect the connector.
• Ensure everything is secured and properly seated.

4. Check and Replace Fuel Injector

• If the problem persists, disconnect the fuel injector connector for cylinder 1.
• Use a noid light to check injector pulse; if there is no signal, inspect wiring for damage.
• If the injector is faulty, remove it using fuel line disconnect tools, and replace it with a new one.
• Reconnect the fuel injector connector.

5. Final Checks

• Reconnect the negative battery terminal.
• Start the engine and ensure it runs smoothly.