my BMW 5 Series F10/F11 (2010-2017) has a check engine light and runs rough what to do

Solution

1. Preparation

1. Gather necessary tools and parts.
2. Disconnect the battery negative terminal to ensure safety while working on electrical components.
3. Ensure the engine is cool before starting any work.

2. Scan and Address Error Codes

1. Connect the OBD-II scanner to the vehicle's diagnostic port.
2. Record and analyze the error codes.
3. Clear the codes and take the vehicle for a short test drive to see if any codes return.

3. Replace Spark Plugs and Ignition Coils

1. Remove the engine cover to access the ignition components.
2. Use a socket set to remove the ignition coils by unscrewing the bolts.
3. Pull out the ignition coils and replace them with new units.
4. Remove the old spark plugs using a spark plug socket, checking the gap on the new plugs before installation.
5. Install the new spark plugs and torque to the manufacturer’s specifications (typically around 15 Nm/11 lb-ft).
6. Reinstall the ignition coils and secure them with the bolts.

4. Inspect and Clean the MAF Sensor

1. Locate the mass airflow sensor in the intake air duct.
2. Carefully disconnect the electrical connector.
3. Remove the MAF sensor using a Torx or Phillips screwdriver.
4. Clean the sensor with MAF cleaner spray, avoiding touching the sensor with tools or fingers.
5. Reinstall the MAF sensor and reconnect the electrical connector.

5. Check Fuel Pressure

1. Attach a fuel pressure gauge to the fuel rail’s service port.
2. Turn the ignition to the "On" position without starting the engine and check the pressure against manufacturer specifications (typically around 50-60 psi).
3. If the pressure is low, consider replacing the fuel pump or fuel filter.

6. Inspect for Vacuum Leaks

1. Visually inspect all vacuum hoses for cracks or disconnections.
2. Use a smoke machine or spray soapy water on suspected areas while the engine is running to detect leaks.
3. Replace any damaged hoses found during inspection.