how to fix P0301 code in Volkswagen Golf MK7 (2015-2019)

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench.
• Remove the ignition coil from cylinder 1.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for wear or carbon buildup. If damaged, replace it with a new spark plug.
• Torque the new spark plug to the manufacturer’s specification (typically around 20-30 Nm).
• Reinstall the ignition coil.

3. Test and Replace Ignition Coil

• If the spark plug is fine but the misfire persists, test the ignition coil.
• Tools Required: Multimeter or ignition coil tester.
• Measure the resistance of the ignition coil according to specifications. If it is outside the recommended range, replace the ignition coil.
• Reinstall the ignition coil and reconnect the electrical connector.

4. Inspect Fuel Injector

• Use a fuel injector tester to check the operation of the fuel injector for cylinder 1.
• If the injector is not functioning correctly, replace it with a new one.
• Reconnect all connections after servicing.

5. Check for Vacuum Leaks

• Inspect all vacuum lines and connections for leaks.
• Use a smoke machine or carb cleaner spray around the intake to identify leaks.
• Replace any damaged hoses or gaskets.

6. Verify Compression

• Tools Required: Compression gauge.
• Perform a compression test on cylinder 1. If compression is low, further investigation into internal engine components (like valves) may be necessary.
• Address any internal engine issues if low compression is detected.