why does my BMW 3 Series F30/F31 (2012-2019) have a check engine light and low power

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on electrical components.
• Allow the engine to cool before starting any work.

2. Address Engine Codes

• If codes indicate a specific issue (e.g., P0171 for a lean condition), proceed with targeted repairs based on the code.
• Clear the codes after addressing the underlying issue to reset the check engine light.

3. Inspect and Replace Air Filter

• Remove the air intake duct.
• Take out the air filter and inspect it for dirt or blockages.
• Replace with a new air filter if it is clogged.
• Reattach the air intake duct securely.

4. Check and Replace Spark Plugs and Ignition Coils

• Remove the engine cover to access the ignition components.
• Disconnect the ignition coils and pull them out along with the spark plugs.
• Inspect the spark plug condition; replace if worn or fouled.
• Install new ignition coils and reattach the connectors.

5. Inspect and Clean MAF Sensor

• Disconnect the electrical connector from the MAF sensor.
• Remove the MAF sensor from the intake system.
• Clean the sensor with MAF cleaner spray; do not use other cleaners that may damage the sensor.
• Reinstall the MAF sensor and reconnect the electrical connector.

6. Test Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "On" position without starting the engine to check the pressure reading.
• Replace the fuel pump or fuel filter if the pressure is outside of the manufacturer's specifications.