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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, noid light.
• Disconnect the battery to ensure safety while working on electrical components.
• Allow the engine to cool before starting repairs.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the ignition coil for cylinder 1 by unscrewing the retaining bolts.
  2. Pull the ignition coil out gently.
  3. Remove the spark plug using a spark plug socket.
  4. Inspect the spark plug for wear, carbon build-up, or damage. Replace if necessary.
  5. Install the new spark plug, torquing it to the manufacturer's specification (usually around 22 lb-ft).
  6. Reinstall the ignition coil and secure it with the retaining bolts.

3. Check and Replace Ignition Coil (if necessary)

• Sub-steps:
  1. If the ignition coil was found to be faulty during inspection, remove it as described above.
  2. Replace with a new ignition coil compatible with the Volkswagen Golf MK7.
  3. Reconnect the electrical connector and ensure a snug fit.

4. Test and Replace Fuel Injector (if necessary)

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Use a noid light to check if the injector is receiving a signal.
  3. If the injector is not functioning, remove it by disconnecting the fuel rail and unscrewing it.
  4. Install a new fuel injector and reassemble the fuel rail.
  5. Reconnect the fuel injector connector.

5. Conduct Compression Test

• Sub-steps:
  1. Remove the spark plug for cylinder 1 again.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine for a few seconds and record the compression reading.
  4. Compare the reading against the manufacturer specifications (typically between 150-200 psi).
  5. If the compression is low, further investigation into engine internals may be necessary.