how to fix the P0301 code on my Volkswagen Golf Eighth Generation (2020-present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, noid light.
• Sub-steps:
  • Disconnect the negative terminal of the battery.
  • Gather all necessary tools and parts for the repair.

2. Inspect and Replace Spark Plug

• Sub-steps:
  • Remove the engine cover (if necessary) to access the spark plugs.
  • Using a spark plug socket, remove the spark plug from cylinder 1.
  • Inspect the spark plug for wear; replace if necessary with a new spark plug that meets the OEM specifications.
  • Torque the new spark plug to the manufacturer’s specification (usually around 20 Nm).
  • Reconnect the spark plug wire or ignition coil.

3. Check and Replace Ignition Coil

• Sub-steps:
  • Disconnect the electrical connector from the ignition coil for cylinder 1.
  • Remove the ignition coil by undoing the retaining bolts and lifting it out.
  • Inspect the coil for signs of damage or corrosion; replace with a new coil if defective.
  • Reinstall the ignition coil and reconnect the electrical connector, ensuring it clicks into place.

4. Conduct Compression Test

• Sub-steps:
  • Remove the spark plug for cylinder 1 again.
  • Insert the compression tester into the spark plug hole.
  • Crank the engine several times to get a reading; it should be within the manufacturer's specified range (typically 120-200 psi).
  • If the compression is low, further investigate for potential internal engine issues.

5. Inspect Fuel Injector

• Sub-steps:
  • Disconnect the fuel injector connector for cylinder 1.
  • Connect a noid light to check for proper signal to the injector.
  • If no signal is detected, further investigate the wiring and ECM.
  • If the injector is malfunctioning, replace it with a new injector.