how to fix P0301 code in Volkswagen Golf Eighth Generation (2020-present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, compression tester, fuel pressure gauge, socket set, torque wrench.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Disconnect the electrical connector.
  • Unbolt the coil using a socket wrench.
• Remove the spark plug using a spark plug socket.
• Inspect the old spark plug for signs of wear, fouling, or damage.
• Install a new spark plug:
  • Apply anti-seize compound to the threads (if recommended).
  • Torque the spark plug to manufacturer specifications (typically around 20 Nm).
• Reinstall the ignition coil:
  • Bolt it back in place and reconnect the electrical connector.

3. Replace Ignition Coil (if necessary)

• If the ignition coil appears damaged or was not functioning correctly, replace it:
  • Remove the faulty ignition coil as described above.
  • Install the new ignition coil and ensure it is seated correctly.
  • Reconnect the electrical connector.

4. Test Fuel Injector

• If misfire persists, check the fuel injector:
  • Disconnect the fuel injector connector.
  • Use a noid light to test the injector pulse.
  • If no pulse is detected, inspect wiring and the engine control module (ECM).
• If the injector is faulty, replace it:
  • Remove the injector from the fuel rail.
  • Install the new injector and reconnect the fuel line.

5. Verify Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail:
  • Turn the ignition to the "ON" position without starting the engine to check pressure.
  • Ensure it meets the manufacturer’s specifications (usually around 3-5 bar).
• If pressure is low, check the fuel pump and filter.