my Volkswagen Golf MK7 (2015-2019) has a check engine light and code P0302, what does that mean?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket, ratchet, anti-seize compound.
• Remove the engine cover if necessary.
• Disconnect the ignition coil connector for cylinder 2.
• Remove the ignition coil using a socket.
• Inspect the spark plug for wear and replace if necessary.
  • Sub-steps:
    • Use a spark plug socket to remove the spark plug.
    • Check the gap and condition; replace with OEM specifications if worn.
    • Apply anti-seize compound to the threads of the new spark plug before installation.
• Reinstall the spark plug and ignition coil, ensuring connections are secure.

3. Check Fuel Injector

• Tools Required: Noid light or multimeter.
• Disconnect the fuel injector connector for cylinder 2.
• Use a noid light to check for signal at the injector connector when the ignition is turned on.
  • Sub-steps:
    • If no signal is detected, trace wiring back to the engine control module (ECM) for faults.
    • If a signal is present, replace the fuel injector for cylinder 2 if it's defective.

4. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug for cylinder 2.
• Insert the compression tester into the spark plug hole and crank the engine.
• Record the pressure reading and compare it to manufacturer specifications.
  • Sub-steps:
    • Perform the test on all cylinders to identify discrepancies.
    • If low compression is found, further investigate piston rings, valves, or head gasket integrity.

5. Reassemble and Test

• Reconnect all components and battery.
• Start the engine and monitor for any further issues.
• Clear the codes using the OBD-II scanner.