how to fix the P0301 code on my Volkswagen Golf MK7.5 (2020-Present)?

Solution

1. Preparation

• 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

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if necessary.
• Disconnect the ignition coil connector and remove the ignition coil from cylinder 1.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for wear or damage; replace it if necessary (use OEM specifications).
• Torque the new spark plug to the manufacturer's specified value (typically around 20 Nm).

3. Check and Replace Ignition Coil

• Reconnect the ignition coil if it was removed.
• If the coil is faulty, replace it with a new ignition coil compatible with your vehicle.
• Ensure the coil is seated properly and reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Remove the fuel injector from cylinder 1.
• Use a fuel injector cleaner or ultrasonic cleaner to clean the injector.
• Inspect O-rings for damage, and replace them if necessary.

5. Perform Compression Test (if needed)

• Tools Required: Compression gauge.
• Remove the spark plug for cylinder 1.
• Insert the compression gauge and crank the engine for a few seconds.
• Check the compression reading; it should be within the manufacturer's specifications (usually around 130-200 psi).
• If compression is low, further investigation into the engine may be necessary (valve issues, head gasket failure).

6. Reassemble and Reconnect

• Reinstall the fuel injector and ignition coil.
• Reconnect the ignition coil connector.
• Reinstall any components removed (engine cover, etc.).
• Reconnect the negative battery terminal.