how to fix P0301 code on Volkswagen Golf MK7 (2015-2019)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector and remove the ignition coil from cylinder 1.
  3. Remove the spark plug using a spark plug socket and ratchet.
  4. Inspect the old spark plug for fouling or damage; replace with a new spark plug if necessary (gapping the new plug as per manufacturer specifications).
  5. Reinstall the spark plug and torque to the manufacturer-recommended specifications.

3. Check and Replace Ignition Coil

• Sub-steps:
  1. If the ignition coil was determined to be faulty in diagnostics, remove it from cylinder 1.
  2. Install a new ignition coil, ensuring proper seating.
  3. Reconnect the ignition coil connector.

4. Inspect and Replace Fuel Injector

• Sub-steps:
  1. If the fuel injector was determined to be faulty, relieve the fuel system pressure.
  2. Disconnect the fuel injector connector and remove the fuel rail if necessary.
  3. Remove the old fuel injector and install a new one, ensuring it is seated properly.
  4. Reconnect the fuel injector connector and reassemble any components removed during the process.

5. Final Checks

• Reconnect the negative battery terminal.
• Start the engine and check for any misfires or error codes using an OBD-II scanner.