my Volkswagen Golf MK5 (2004-2008) has a check engine light and code P0302, what does it mean?

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Disconnect the battery to ensure safety while working on electrical components.
• Allow the engine to cool before proceeding.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, dielectric grease, wire brush.
• Remove the engine cover (if applicable).
• Disconnect the ignition coil connector for cylinder 2.
• Remove the ignition coil bolt and gently pull the coil out.
• Remove the spark plug using a spark plug socket and inspect it for wear or fouling.
• Replace the spark plug with a new one, ensuring proper gap according to manufacturer specifications (typically 0.028-0.032 inches).
• Apply dielectric grease to the ignition coil boot and reinstall the ignition coil.
• Torque the ignition coil bolt to the manufacturer’s specification (typically 10-15 Nm).

3. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner, fuel injector removal tool (if necessary).
• If the ignition components are functioning properly, test the fuel injector for cylinder 2.
• Remove the fuel injector connector and inspect for corrosion.
• Clean the injector using a fuel injector cleaner or replace it if necessary.
• Reinstall the fuel injector and connector securely.

4. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 2.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare the reading to the manufacturer’s specifications (typically 120-200 psi). If low, further investigation into engine internals may be required.