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

Solution

1. Preparation

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

2. Inspect Spark Plug

• Tools Required: Spark plug socket, torque wrench, ratchet.
• Remove the ignition coil from cylinder 1.
• Use the spark plug socket to carefully remove the spark plug.
• Inspect the spark plug for excessive wear, carbon buildup, or damage.
• If worn/damaged: Replace with OEM equivalent spark plug, torque to specifications (usually around 18 lb-ft).

3. Check Ignition Coil

• Reconnect the ignition coil and check for proper connection.
• If the coil appears faulty (cracks, corrosion), replace it with a new ignition coil.
• Ensure the new coil is seated correctly and reattach any clips.

4. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine for a few seconds and read the compression value.
• If low compression: Further investigation is needed for potential internal engine issues.

5. Inspect Fuel Injector

• Remove the fuel injector connector and inspect for proper fit and any signs of damage.
• Use a multimeter to test the injector's resistance (follow manufacturer specifications).
• If faulty, replace the injector with an OEM part, ensuring proper seating and connection.

6. Check for Vacuum Leaks

• Inspect hoses and intake manifold gaskets for wear or damage.
• Use a smoke machine or carburetor cleaner to detect leaks.
• Repair or replace any damaged components.