how to fix P0303 misfire code in Volkswagen Golf Seventh Generation (2013-2020)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to avoid electrical shock and short circuits.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil from cylinder 3 by unscrewing it.
• Take out the old spark plug using a spark plug socket.
• Inspect the new spark plug for proper gap (typically 0.028-0.032 inches for VW).
• Install the new spark plug and torque it to the manufacturer's specification (usually 22 lb-ft).
• Reinstall the ignition coil and ensure it's seated properly.

3. Replace Ignition Coil (if necessary)

• Tools Required: Socket set, ratchet.
• If the ignition coil is faulty, remove it from cylinder 3.
• Install the new ignition coil and secure it with the appropriate fasteners.
• Reconnect the electrical connector to the ignition coil.

4. Inspect and Clean Fuel Injector (if necessary)

• Tools Required: Fuel injector cleaner, small brush.
• If a fuel injector is suspected of being clogged, remove it from cylinder 3.
• Clean the injector using a fuel injector cleaner and inspect for proper operation.
• Reinstall the cleaned or new injector, ensuring all seals are intact.

5. Final Check

• Reconnect the negative battery terminal.
• Start the engine and allow it to idle, checking for any misfire symptoms.