how to fix P0301 code in Volkswagen Golf MK6 (2009-2014) for cylinder 1 misfire?

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Remove the ignition coil for cylinder 1 using a socket wrench.
• Remove the spark plug with a spark plug socket.
• Inspect the spark plug for wear and replace it if necessary. Use the manufacturer's recommended spark plug type.
• Reinstall the spark plug and torque it to the manufacturer's specification (typically around 20-30 Nm).

3. Check and Replace Ignition Coil

• If the spark plug is in good condition, inspect the ignition coil for cracks or damage.
• Remove the ignition coil from cylinder 1.
• Replace the ignition coil with a new one if it is faulty.
• Reconnect the ignition coil connector.

4. Inspect and Test Fuel Injector

• Disconnect the fuel injector harness for cylinder 1.
• Use a multimeter to check the resistance of the injector (should be within specifications).
• If the injector is faulty, remove it using a fuel injector puller and replace it with a new one.
• Reconnect the fuel injector harness.

5. Conduct Compression Test (if necessary)

• If the above steps do not resolve the issue, perform a compression test on cylinder 1.
• Remove the spark plug and insert the compression tester.
• Crank the engine and note the compression reading. It should be within the manufacturer's specification (typically around 125-150 psi).
• If the compression is low, further investigation is needed for potential internal engine issues.