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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Replace Spark Plug

• Remove the engine cover if necessary.
• Use a spark plug socket and ratchet to remove the spark plug from cylinder 1.
• Inspect the old spark plug for wear or damage.
• Install the new spark plug and torque it to the manufacturer's specification (typically 18-22 ft-lbs for BMW).
• Reinstall the engine cover if removed.

3. Inspect and Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil on cylinder 1.
• Remove the ignition coil by pulling it straight out.
• Inspect the ignition coil for any cracks or signs of failure.
• Install the new ignition coil and reconnect the electrical connector.

4. Test Fuel Injector

• If the ignition components are functioning properly, test the fuel injector for cylinder 1.
• Disconnect the fuel injector connector and use a noid light to check for signal.
• If no signal is present, further investigate wiring and ECU issues. If the injector is faulty, replace it.

5. Perform Compression Test

• If misfire persists, perform a compression test on cylinder 1.
• If compression is below the manufacturer's specifications, further diagnosis is needed to inspect valves, piston rings, or head gasket.