how to fix P0303 misfire code in Volkswagen Golf Eighth Generation (2020-present)

Solution

1. Preparation

• Gather necessary tools and replacement parts.
• Ensure the engine is cool and disconnect the negative battery terminal for safety.

2. Replace Spark Plug and Ignition Coil

• Remove engine cover if applicable using a socket set.
• Disconnect the electrical connector from the ignition coil on cylinder 3.
• Remove the ignition coil by unbolting it (usually a couple of screws).
• Remove the spark plug using a spark plug socket.
• Inspect the old spark plug for wear or damage; if fouled, replace it.
• Install a new spark plug (torque to specification: typically 15-20 Nm).
• Install the new ignition coil and reconnect the electrical connector.

3. Inspect and Replace Fuel Injector (if necessary)

• Remove the fuel rail bolts to gain access to the fuel injectors.
• Disconnect the fuel line (use a rag to catch any spills).
• Remove the fuel injector from cylinder 3 by pulling it straight out of the rail.
• Inspect the injector for clogs or damage; replace if necessary.
• Reinstall the fuel injector, ensuring it seats properly in the rail.
• Reconnect the fuel line and reattach the fuel rail to the engine.

4. Check for Vacuum Leaks

• Inspect all vacuum hoses connected to the intake manifold for cracks or damage.
• Use a smoke machine or carburetor cleaner to check for leaks around the intake manifold.