how to fix P0301 code on 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 engine cover if applicable.
• Locate the spark plug for cylinder 1.
• Use the spark plug socket to remove the spark plug.
• Inspect the spark plug for deposits, cracks, or wear.
• If worn or damaged, replace with a new spark plug (OEM recommended).
• Torque the new spark plug to the manufacturer’s specifications (typically around 22 Nm).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set
• Remove the ignition coil from cylinder 1 by unplugging the electrical connector and removing the retaining bolts.
• Inspect the coil for cracks or corrosion.
• If defective, replace the ignition coil with a new OEM part.
• Reinstall the ignition coil and ensure the connector is securely attached.

4. Check and Clean Fuel Injector

• Tools Required: Fuel injector cleaner, fuel system cleaning kit
• Disconnect the fuel injector connector for cylinder 1.
• Perform a fuel injector cleaning procedure using a fuel injector cleaner to ensure proper operation.
• If the injector is faulty, replace it with an OEM injector.

5. Perform Compression Test

• Tools Required: Compression gauge
• Remove the spark plug for cylinder 1.
• Insert the compression gauge into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare the reading with the manufacturer’s specifications; if low, further diagnosis may be necessary (potentially indicating valve or piston issues).