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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable using a socket set.
  2. Disconnect the ignition coil connector for cylinder 3.
  3. Remove the ignition coil from cylinder 3.
  4. Use a spark plug socket to remove the spark plug from cylinder 3.
  5. Inspect the spark plug for wear and ensure it is gapped correctly (typically 0.028-0.032 inches).
  6. Replace with a new spark plug if necessary.
  7. Reinstall the ignition coil and reconnect the connector.

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. If the spark plug replacement does not resolve the issue, replace the ignition coil for cylinder 3.
  2. Remove the old ignition coil and install the new coil.
  3. Ensure all connections are secure and properly seated.

4. Check and Replace Fuel Injector

• Sub-steps:
  1. If misfire persists, inspect the fuel injector for cylinder 3.
  2. Remove the injector connector and bracket.
  3. Use a fuel injector cleaning kit or replace the injector if faulty.
  4. Reconnect the injector and bracket securely.

5. Reassemble and Test

• Reassemble any components removed for access.
• Reconnect the negative battery terminal.
• Start the engine and check for any new codes or symptoms.