my Volkswagen Golf MK6 (2009-2014) throws a check engine light with P0302 code

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off and cool.

Tools Required:

• OBD-II scanner
• Spark plug socket
• Torque wrench
• Compression tester
• Fuel injector cleaning kit (if applicable)

2. Inspect Ignition Components

• Remove the engine cover to access the ignition coils.
• Disconnect the electrical connector from the ignition coil for cylinder 2.
• Remove the ignition coil using the spark plug socket.
• Inspect the coil for damage or wear, and replace if necessary.
• Check the spark plug for wear; replace if it shows signs of fouling or damage.
• Reinstall the ignition coil after inspection or replacement.

3. Check for Vacuum Leaks

• Visually inspect all hoses connected to the intake manifold for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to detect vacuum leaks while the engine is running.
• Repair or replace any faulty hoses or gaskets.

4. Perform Compression Test

• Remove the spark plug from cylinder 2.
• Insert the compression tester into the spark plug hole.
• Crank the engine several times while observing the gauge readings.
• Compare the readings with specifications; if low, further investigation is required into piston rings or valves.

5. Inspect and Clean Fuel Injector

• Disconnect the fuel line and electrical connector from the fuel injector for cylinder 2.
• Remove the fuel injector using appropriate tools.
• Clean the injector using a dedicated injector cleaning kit.
• Reinstall the injector and reconnect the fuel line, ensuring no leaks.