what does P0301 code mean for my BMW 5 Series G30/G31 (2017-2024)?

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the ignition coil from cylinder 1.
  • Disconnect the electrical connector.
  • Unbolt and remove the coil.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for signs of wear or fouling.
• If damaged, replace with a new spark plug, ensuring it matches OEM specifications.
• Torque the new spark plug to the manufacturer's specifications (usually around 22 lb-ft).

3. Check and Replace Ignition Coil

• Tools Required: Socket set, multimeter
• If the spark plug is in good condition, check the ignition coil.
• Test the coil's resistance with a multimeter; compare readings to manufacturer specifications.
• If faulty, replace the ignition coil with a new one, ensuring proper fit and connection.

4. Inspect and Test Fuel Injector

• Tools Required: Noid light or fuel injector tester
• Check the fuel injector for cylinder 1 by connecting a noid light to ensure it’s receiving a signal.
• If there’s no signal or injector is malfunctioning, replace the fuel injector.
• Ensure proper reinstallation and connection before closing the engine.

5. Compression Test

• Tools Required: Compression tester
• Perform a compression test on cylinder 1.
• If compression is low, further investigation into the valve seals or piston rings may be necessary.