how to fix P0301 cylinder 1 misfire in Volkswagen Golf Eighth Generation (2020-present)?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before working.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set (including a spark plug socket), torque wrench
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector for cylinder 1.
• Remove the ignition coil by unscrewing the retaining bolts.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for wear, carbon buildup, or damage. Replace if necessary.
• Install a new spark plug, torquing it to the manufacturer's specification (typically around 20 Nm or 15 lb-ft).
• Reattach the ignition coil and connector.

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench
• If the spark plug is fine, inspect the ignition coil for cracks or carbon tracking.
• Remove the ignition coil as previously described.
• Replace with a new ignition coil, ensuring proper seating.
• Torque the ignition coil screws to manufacturer specifications.

4. Check and Clean Fuel Injector

• Tools Required: Fuel injector cleaner, appropriate sockets
• Disconnect the fuel injector connector for cylinder 1.
• Remove the fuel rail if necessary to access the injector.
• Inspect the injector for clogs or damage. Clean or replace it as needed.
• Reassemble the fuel rail and reconnect the injector.

5. Compression Test

• Tools Required: Compression tester
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare the reading to the manufacturer's specifications. If low, further investigation into engine internals may be required.