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

Solution

1. Preparation

• Gather necessary tools and safety equipment.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if applicable.
• Remove the ignition coil for cylinder 3 by unscrewing the retaining bolts.
• Extract the spark plug using the spark plug socket.
• Inspect the spark plug for wear or damage. Replace if necessary.
• Install the new spark plug and torque it to the manufacturer’s specifications (typically 15-20 lb-ft).
• Reinstall the ignition coil and secure it with the bolts.

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• If the spark plug is in good condition, inspect the ignition coil for signs of wear or failure.
• Remove the ignition coil and inspect the connector and wiring.
• Replace the ignition coil with a new one if it shows signs of damage.
• Torque the new ignition coil to the manufacturer's specifications.

4. Inspect and Replace Fuel Injector

• Tools Required: Fuel injector puller, socket set.
• If the ignition components are functioning properly, check the fuel injector.
• Disconnect the fuel line and electrical connector from the injector.
• Remove the injector using a fuel injector puller.
• Inspect the injector for clogs or damage. Replace if necessary.
• Install the new injector and reconnect the fuel line and electrical connector.

5. Reassembly and Final Check

• Reconnect the battery.
• Clear the error codes using the OBD-II scanner.
• Start the engine and check for any irregularities.