how to fix P0301 misfire code on BMW X5 F15 (2014-2019)

Solution

1. Preparation

• Gather tools and ensure the vehicle is parked on a level surface.
• Disconnect the negative terminal of the battery to prevent electrical shorts.

2. Replace Ignition Coil

• Tools Required: Socket set, torque wrench
• Remove the engine cover if necessary.
• Disconnect the electrical connector from the ignition coil on cylinder 1.
• Unscrew the ignition coil using the socket set.
• Install the new ignition coil and tighten to the manufacturer’s torque specification (usually around 7 Nm).
• Reconnect the ignition coil's electrical connector.

3. Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench
• Remove the ignition coil again to access the spark plug.
• Use the spark plug socket to carefully unscrew and remove the old spark plug.
• Inspect the spark plug threads for damage, and clean if necessary.
• Install a new spark plug, ensuring it’s properly gapped to the manufacturer’s specifications (typically around 0.7-0.8 mm).
• Tighten the spark plug to the manufacturer’s specified torque (around 25 Nm).

4. Inspect and Test Fuel Injector

• Tools Required: Multimeter, fuel pressure gauge
• Remove the fuel injector connector for cylinder 1.
• Use the multimeter to test the injector's resistance; compare it to manufacturer specifications (usually around 12-16 ohms).
• If the injector is faulty, replace it with a new unit. Ensure the O-ring is lubricated and properly seated during installation.

5. Reassemble and Clear Codes

• Reinstall any components removed for access.
• Reconnect the negative terminal of the battery.
• Use the OBD-II scanner to clear the P0301 code and any other codes present.