how to fix P0300 code on my Volkswagen Golf MK7.5 (2020-Present)?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the vehicle's battery to prevent electrical shorts.
• Allow the engine to cool completely before starting work.

2. Replace Spark Plugs

• Tools Required: Socket set, torque wrench
• Remove ignition coil covers if necessary.
• Using a spark plug socket, unscrew the old spark plugs from the engine.
• Inspect the old spark plugs for wear; note any unusual wear patterns.
• Install new spark plugs, ensuring they are gapped correctly per manufacturer specifications (typically around 0.028-0.032 inches).
• Torque the spark plugs to the manufacturer's specification (usually around 15-20 ft-lbs).

3. Inspect and Replace Ignition Coils

• Tools Required: Socket set
• Remove the ignition coils by unscrewing them and carefully lifting them out.
• Inspect each ignition coil for signs of damage or corrosion.
• Replace any faulty ignition coils with new ones, ensuring they are seated properly.

4. Clean or Replace Fuel Injectors

• Tools Required: Fuel injector cleaner kit or new injectors
• If cleaning, follow the instructions on the fuel injector cleaner kit to flush the injectors.
• If replacing, disconnect the fuel lines and electrical connectors, remove the old injectors, and install new ones, ensuring proper seating and sealing.

5. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position without starting the engine and observe the pressure reading.
• Compare the reading with manufacturer specifications (usually around 50-60 psi for the Golf MK7.5).
• If the pressure is low, inspect the fuel pump and filter for issues.