my Volkswagen Golf has a check engine light with code P0302; what does it mean?

Solution

1. Preparation

• Gather necessary tools and parts. Ensure the engine is cool before starting work.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2.
• Unscrew and remove the spark plug from cylinder 2 using a spark plug socket.
• Inspect the spark plug for wear, carbon buildup, or damage. Replace if necessary.
• Install a new spark plug and torque it to the manufacturer's specification (usually around 20-25 Nm).

3. Inspect and Replace Ignition Coil

• If the spark plug appears to be in good condition, inspect the ignition coil for cracks or carbon tracking.
• Disconnect the electrical connector and remove the ignition coil from cylinder 2.
• Install a new ignition coil, ensuring it clicks securely into place.
• Reconnect the electrical connector.

4. Check and Replace Fuel Injector

• If the misfire persists, test the fuel injector for cylinder 2.
• Remove the fuel rail to access the injector, following safety procedures for fuel systems.
• Replace the fuel injector if it is clogged or malfunctioning.
• Reassemble the fuel rail and ensure there are no leaks.

5. Perform Compression Test

• If the issue continues, conduct a compression test on cylinder 2.
• Remove the spark plug and install a compression gauge.
• Crank the engine and record the compression reading. If below specifications, further investigation is needed.