how to fix the P0302 misfire code on my Volkswagen Golf MK6 (2009-2014)?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coil from cylinder 2 by unscrewing the bolts.
• Carefully pull out the spark plug using the spark plug socket.
• Inspect the old spark plug for signs of wear or deposits.
• Install a new spark plug, applying dielectric grease to the threads.
• Torque the new spark plug to the manufacturer’s specifications (typically around 22 ft-lbs).

3. Inspect and Replace Ignition Coil

• If the spark plug was fine, proceed to inspect the ignition coil.
• Swap the ignition coil from cylinder 2 with another working cylinder.
• Test the vehicle to see if the misfire moves to the swapped cylinder; if it does, replace the ignition coil for cylinder 2.

4. Check and Clean Fuel Injector

• If the ignition coil is functioning correctly, inspect the fuel injector for cylinder 2.
• Remove the injector and check for clogs. Clean it using a fuel injector cleaner if necessary.
• If cleaning does not resolve the issue, replace the fuel injector.

5. Compression Test (if needed)

• If the issue persists, perform a compression test on cylinder 2.
• Remove the spark plug and insert the compression gauge into the cylinder.
• Crank the engine and check the compression reading. Ensure it meets manufacturer specifications (typically around 150 psi).
• If compression is low, further investigation into internal engine components may be needed (e.g., valve seals, piston rings).