how to diagnose P0302 code in Volkswagen Golf MK7 (2015-2019)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface with the engine off and cool.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the engine cover if necessary.
• Disconnect the ignition coil connector.
• Remove the ignition coil and inspect the spark plug.
• Replace the spark plug with a new one if worn or fouled.
• Torque the spark plug to manufacturer specifications (usually around 25-30 Nm).

3. Check and Replace Ignition Coil

• If the spark plug is in good condition, inspect the ignition coil for cracks or signs of wear.
• If faulty, replace the ignition coil for cylinder 2.
• Reinstall the ignition coil and connect the electrical connector firmly.

4. Inspect Fuel Injector

• Tools Required: Noid light or multimeter.
• Disconnect the fuel injector connector for cylinder 2.
• Use a noid light to check for signal; if no signal, troubleshoot wiring or ECU.
• If the injector is faulty, replace it with a new one.

5. Check for Vacuum Leaks

• Inspect all vacuum lines and the intake manifold gasket.
• Replace any damaged hoses or gaskets as needed.

6. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug for cylinder 2 and install the compression tester.
• Crank the engine and record the compression reading; compare to specifications.
• If low, further investigate possible internal engine issues.