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

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench.
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector and remove the ignition coil from cylinder 2.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for wear or carbon buildup; replace it if necessary.
• Install the new spark plug and torque it to the manufacturer’s specification (usually around 20-30 Nm).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil (if necessary)

• Tools Required: Socket set, torque wrench.
• If the ignition coil shows signs of damage (cracks, corrosion), replace it with a new one.
• Install the new ignition coil and tighten it to the specified torque (typically around 10 Nm).
• Reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit or replacement injector.
• If the fuel injector is suspected to be clogged, remove it from the engine.
• Clean the fuel injector using a professional cleaning kit or replace it with a new one if necessary.
• Ensure proper sealing when re-installing the injector to prevent leaks.

5. Compression Test (if misfire persists)

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 2 and install the compression tester.
• Crank the engine and record the compression reading.
• Compare the reading to manufacturer specifications; low compression may indicate internal engine issues.