how to resolve the P0301 code in my Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety while working on the electrical system.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench
• Remove the ignition coil for cylinder 1 by unscrewing the bolts and gently pulling it out.
• Remove the spark plug using the spark plug socket.
• Inspect the old spark plug for wear and gap; replace with a new spark plug if necessary.
• Install the new spark plug and torque it to manufacturer specifications (typically around 22 lb-ft).
• Reinstall the ignition coil over the new spark plug.

3. Inspect/Replace Ignition Coil

• If the ignition coil is suspected to be faulty, replace it.
• Tools Required: Ratchet, socket set
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil from the engine by unscrewing any retaining bolts.
• Install the new ignition coil and reconnect the electrical connector.

4. Inspect/Replace Fuel Injector

• If the fuel injector is clogged or malfunctioning, replace it.
• Tools Required: Fuel injector puller, ratchet, socket set
• Relieve the fuel system pressure by removing the fuel pump fuse and running the engine until it stalls.
• Disconnect the electrical connector and fuel line from the fuel injector.
• Remove the fuel injector from the intake manifold.
• Install the new fuel injector ensuring proper seating and reconnect the fuel line and electrical connector.

5. Compression Test

• If misfire persists, perform a compression test for cylinder 1.
• Tools Required: Compression gauge
• Remove the spark plug from cylinder 1.
• Insert the compression gauge into the spark plug hole and crank the engine several times.
• Compare the reading to the manufacturer’s specifications (typically should be above 120 psi).
• If compression is low, further investigation into the engine internals may be necessary.