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

Solution

1. Preparation

• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil cover if applicable.
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil by unscrewing it from the cylinder head.
• Use a spark plug socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for carbon buildup, wear, or damage. Replace with a new spark plug if necessary, torquing to the manufacturer's specification (typically around 20 Nm).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Ignition Coil

• If the spark plug is fine, swap the ignition coil from cylinder 1 with another cylinder.
• Clear the engine codes and take the vehicle for a test drive.
• If the P0301 code returns, replace the ignition coil for cylinder 1.

4. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Connect the compression tester in place of the spark plug.
• Crank the engine and record the compression reading. Compare it with the manufacturer’s specifications (usually around 200 psi).
• If compression is low, further investigation into piston rings or valve seals may be necessary.

5. Inspect Fuel Injector

• If ignition components are functioning properly, check the fuel injector for cylinder 1.
• Tools Required: Multimeter or noid light.
• Disconnect the fuel injector connector and use a multimeter to check for voltage while cranking the engine.
• If no voltage is detected, check the wiring and connections.
• If voltage is present, but the injector is not firing, replace the fuel injector.