how to fix the check engine light P0301 in my Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the negative terminal of the battery for safety.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench, dielectric grease.
• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear, carbon buildup, or damage. Replace it if necessary.
• Install the new spark plug, torquing it to the manufacturer's specification (typically around 22 lb-ft).
• Apply a small amount of dielectric grease to the ignition coil connector to ensure a good electrical connection.

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, proceed to inspect the ignition coil.
• Tools Required: Ratchet, socket set.
• Remove the ignition coil from cylinder 1, if not already done.
• Inspect for cracks or carbon tracking. Replace if damaged.
• Install the new ignition coil and tighten the bolts to the manufacturer's specifications.

4. Compression Test

• Tools Required: Compression tester.
• Reconnect the battery and remove the fuel pump relay to prevent fuel injection during the test.
• Crank the engine to take compression readings on cylinder 1.
• Compare the readings to the manufacturer's specifications. If low, further investigation of internal engine components is required.

5. Inspect Fuel Injector

• Use a fuel pressure gauge to check the fuel pressure at the injector rail.
• Tools Required: Fuel pressure gauge, injector cleaning kit.
• If pressure is low, consider replacing the fuel filter or fuel pump.
• If the fuel injector is suspected of being clogged, remove it and clean it with an injector cleaning kit or replace it if cleaning doesn't work.