what does it mean if my BMW 5 Series G30/G31 (2017-2024) shows code P0301

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to prevent electrical shorts.

2. Inspect and Replace Ignition Components

1. Remove Engine Cover:

   • Use a socket set to remove any fasteners securing the engine cover.
   • Carefully lift off the cover and set it aside.

2. Remove Spark Plug:

   • Use a spark plug socket and ratchet to remove the spark plug from cylinder 1.
   • Inspect the spark plug for wear or damage; replace if necessary.

3. Replace Ignition Coil:

   • Unplug the electrical connector from the ignition coil.
   • Remove the ignition coil securing bolts with a socket set.
   • Replace the ignition coil with a new one and reattach the connector.

3. Inspect and Replace Fuel Injector

1. Access Fuel Injector:

   • Remove any components obstructing access to the fuel injector on cylinder 1.

2. Remove Fuel Injector:

   • Disconnect the electrical connector from the fuel injector.
   • Remove the retaining clips or bolts securing the injector.
   • Carefully pull the injector out of the rail.

3. Install New Fuel Injector:

   • Lubricate the O-rings on the new injector with clean engine oil.
   • Insert the new injector into the rail, securing it with the clips or bolts.

4. Conduct a Compression Test

1. Install Compression Gauge:

   • Remove the spark plug from cylinder 1 and install a compression gauge.

2. Crank Engine:

   • Have an assistant crank the engine while you observe the gauge.
   • Record the compression reading. Compare it to the manufacturer's specifications.

5. Reassemble Components

• Reinstall the spark plug and engine cover.
• Reconnect the negative battery terminal.