how to fix P0303 code in my Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the engine cover if applicable.
• Locate the spark plug for cylinder 3, which is typically found on the side of the engine.
• Using the spark plug socket, carefully remove the old spark plug.
• Inspect the old spark plug for signs of wear or fouling.
• Apply dielectric grease to the threads of the new spark plug.
• Install the new spark plug and torque it to manufacturer specifications (usually around 20-30 Nm).
• Reconnect the engine cover.

3. Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Locate the ignition coil for cylinder 3.
• Disconnect the electrical connector from the ignition coil.
• Remove the mounting screws for the ignition coil.
• Replace the faulty ignition coil with a new one, ensuring it seats properly.
• Torque the screws to manufacturer specifications.
• Reconnect the electrical connector.

4. Inspect/Replace Fuel Injector

• Tools Required: Fuel injector removal tool, socket set, torque wrench.
• Locate the fuel injector for cylinder 3.
• Disconnect the electrical connector from the fuel injector.
• Remove any retaining clips or screws securing the fuel rail.
• Carefully pull the fuel rail away to access the injector.
• Remove the old injector and replace it with a new one, ensuring the O-rings are lubricated with engine oil.
• Reassemble the fuel rail and reconnect all electrical connections.