my Volkswagen Passat B8 (2015-2022) has a check engine light with code P0302, what does it mean?

Solution

1. Preparation

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

2. Inspect Spark Plug and Ignition Coil

• Remove the engine cover (if applicable) using a socket set.
• Disconnect the ignition coil connector for cylinder 2.
• Remove the ignition coil using a socket and ratchet.
• Inspect the spark plug for wear, carbon build-up, or damage. Replace if necessary.
• Test the ignition coil with a multimeter for proper resistance. Replace if out of specifications.

3. Check Fuel Injector

• Disconnect the fuel injector connector for cylinder 2.
• Use a fuel injector tester to ensure it is functioning correctly.
• If defective, replace the fuel injector.

4. Perform Compression Test

• Remove the spark plug from cylinder 2.
• Insert a compression gauge into the spark plug hole.
• Crank the engine and record the compression reading.
• If the compression is below specifications, further engine diagnostics may be needed.

5. Inspect for Vacuum Leaks

• Visually inspect vacuum lines connected to the intake manifold.
• Use a smoke machine or carburetor cleaner to detect leaks around the intake manifold.
• Replace any damaged vacuum lines or gaskets.

6. Reassemble and Test

• Reinstall any removed components in reverse order.
• Reconnect the negative battery terminal.
• Start the engine and monitor for any check engine light re-illumination.