my BMW 5 Series G30/G31 (2017-2024) has a P0301 code, what does that mean?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool completely before beginning work.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts.
• Disconnect the electrical connector from the ignition coil.
• Remove the old spark plug using a spark plug socket.
• Inspect the new spark plug and ensure it matches the specifications (gap, heat range).
• Install the new spark plug, tightening to the manufacturer’s specified torque (usually around 20 Nm).
• Reattach the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil appears damaged or faulty during inspection, replace it.
• Tools Required: Ratchet and socket set.
• Remove the old ignition coil by unscrewing the retaining bolts.
• Install the new ignition coil and reconnect the electrical connector.

4. Test Fuel Injector (if necessary)

• If the injector is suspected to be faulty, perform a resistance test.
• Tools Required: Multimeter.
• If out of specification, remove and replace the fuel injector.
• Clean the injector ports before installation of the new injector.

5. Compression Test (if necessary)

• If misfire persists, conduct a compression test on cylinder 1.
• Tools Required: Compression tester.
• Insert the compression tester into the spark plug hole and crank the engine.
• Compare the reading to the manufacturer’s specifications; if low, further investigation into the engine's internals may be necessary.