how to diagnose P0302 code in my Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and secure it with wheel chocks.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench
• Remove the ignition coil from cylinder 2 by unbolting it and disconnecting the electrical connector.
• Remove the spark plug from cylinder 2 using a socket.
• Inspect the spark plug for signs of fouling, wear, or damage; replace if necessary.
• Check the ignition coil for cracks or damage; replace if needed.
• Reinstall the spark plug and ignition coil, torquing the spark plug to 20 Nm (15 lb-ft).

3. Check Fuel Injector Operation

• Tools Required: Noid light or multimeter
• Disconnect the fuel injector connector from cylinder 2.
• Connect a noid light to the injector harness to check for pulse while cranking the engine.
• If the noid light does not flash, inspect the wiring and replace the injector if necessary.

4. Perform Compression Test

• Tools Required: Compression tester
• Remove the spark plug from cylinder 2 and insert the compression tester.
• Crank the engine and record the compression reading.
• Compare it to specifications (typically between 120-200 psi) and to other cylinders; replace or repair if low.

5. Check for Vacuum Leaks

• Tools Required: Vacuum gauge, smoke machine (optional)
• Attach a vacuum gauge to a manifold vacuum port and check the readings. Look for low readings indicating a leak.
• Use a smoke machine to detect any vacuum leaks around the intake manifold.