what does error code P0301 indicate for BMW 5 Series F10/F11 (2010-2017)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Tools required: socket set, torque wrench, spark plug socket, compression tester, OBD-II scanner.
• Ensure the engine is cool and disconnect the battery to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1 by unscrewing it.
• Use the spark plug socket to remove the spark plug.
• Inspect the spark plug for wear or fouling; replace it if necessary.
• Install a new spark plug, tightening it to the manufacturer’s specified torque (typically around 20 Nm).
• Reinstall the ignition coil onto the spark plug.

3. Check and Replace Ignition Coil

• If the ignition coil appears faulty during inspection, remove it from cylinder 1.
• Compare the part number with the manufacturer's specifications to ensure compatibility.
• Install a new ignition coil, tightening it to the manufacturer’s specified torque.

4. Inspect Fuel Injector

• Disconnect the fuel injector electrical connector.
• Remove the fuel injector retaining clips and the injector itself.
• Inspect the injector for clogs or damage; replace if necessary.
• Reinstall the fuel injector and secure it with the retaining clips.

5. Perform Compression Test

• Remove the spark plug from cylinder 1 and connect the compression tester.
• Crank the engine several times to obtain a compression reading.
• Compare the reading to manufacturer specifications; if low, further investigation into engine internals may be needed.

6. Recheck and Reconnect

• Check all connections and wiring related to cylinder 1.
• Reconnect the battery.
• Clear any error codes using the OBD-II scanner.