how to diagnose my Volkswagen Golf MK7 (2015-2019) with a P0302 code

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to avoid electrical short circuits.
• Ensure the engine is cool before beginning work.

2. Inspect Spark Plug

• Remove the ignition coil from cylinder 2.
  • Tools: Socket set
• Remove the spark plug from cylinder 2.
  • Tools: Spark plug socket
• Inspect the spark plug for wear, carbon buildup, or damage.
• Replace the spark plug if necessary.

3. Check Ignition Coil

• Test the ignition coil for cylinder 2 using an ohmmeter.
  • Tools: Multimeter
• Replace the ignition coil if it does not meet manufacturer specifications.

4. Compression Test

• Remove the spark plug from cylinder 2.
• Insert the compression gauge and crank the engine to measure the compression.
  • Tools: Compression tester
• Compare the reading to the vehicle's specifications; if low, further investigation of the engine may be required.

5. Inspect Fuel Injector

• Remove the fuel rail to access the injector for cylinder 2.
  • Tools: Socket set
• Check the fuel injector for clogging or damage.
• Test the injector for proper operation using a multimeter or injector tester.
• Replace the injector if it is faulty.

6. Check for Vacuum Leaks

• Visually inspect all hoses connected to the intake manifold for cracks or disconnections.
• Use a smoke tester to identify any vacuum leaks in the system.