how to fix the P0301 code on my Volkswagen Golf MK7 (2015-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool if it has been running.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover if equipped.
• Disconnect the ignition coil connector for cylinder 1.
• Unbolt the ignition coil using a socket and remove it.
• Inspect the spark plug; if worn or fouled, remove it with a spark plug socket.
• Replace the spark plug with a new one, ensuring the gap is set according to manufacturer specifications (typically around 0.028 inches).
• Reinstall the ignition coil and secure it with the bolts, torquing them to the manufacturer’s specification (usually around 15 Nm).
• Reconnect the ignition coil connector.

3. Check and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit (if needed), multimeter
• Access the fuel injector on cylinder 1 by removing any necessary components.
• Disconnect the fuel injector connector and test for voltage using a multimeter.
• If there is no power, check wiring and connections back to the ECM.
• If power is present, remove the injector. Clean it using a fuel injector cleaning kit or replace it if necessary.
• Reinstall the injector and reconnect the connector.

4. 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 for a few seconds and note the compression reading. Repeat for accuracy.
• Compare the reading to the manufacturer's specifications. If it’s low, further diagnostics of the valves or piston rings may be required.

5. Inspect Vacuum Lines

• Visually inspect all vacuum lines and the intake manifold for cracks or disconnections.
• Replace any damaged lines to ensure proper air/fuel mixture.