what should I do if my BMW 5 Series G30/G31 (2017-2024) has a P0302 code?

Solution

1. Preparation

• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Gather necessary tools and parts.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, ratchet.
• Remove the spark plug wire or ignition coil for cylinder 2.
• Using the spark plug socket, carefully remove the spark plug.
• Inspect the spark plug for signs of fouling, wear, or damage. Replace it if necessary.
• Install the new spark plug and torque it to the manufacturer's specifications (typically around 18-22 ft-lbs).
• Reattach the ignition coil or spark plug wire.

3. Test and Replace Ignition Coil

• Tools Required: Multimeter, socket set.
• Remove the ignition coil for cylinder 2.
• Use a multimeter to test the resistance of the ignition coil (refer to the manufacturer’s specifications).
• If the coil is faulty, replace it with a new ignition coil and reconnect it.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner kit, socket set.
• Remove the fuel injector for cylinder 2.
• Inspect the injector for clogs or damage. Clean the injector using a fuel injector cleaner kit.
• Reinstall the cleaned or new fuel injector.

5. Compression Test (if necessary)

• Tools Required: Compression tester.
• Remove all spark plugs.
• Insert the compression tester into the spark plug hole for cylinder 2.
• Crank the engine and record the compression reading. Compare with manufacturer specifications.
• If compression is low, further investigation is required (e.g., valve or piston issues).