why is my BMW 3 Series F30/F31 (2012-2019) losing power while driving?

Solution

1. Preparation

• Tools Required: OBD-II scanner, fuel pressure gauge, socket set, torque wrench, multimeter.
• Disconnect the negative battery cable to prevent electrical shorts.
• Ensure the engine is cool before beginning any work.

2. Addressing Error Codes

• If any error codes are present after scanning:
  • Research the specific codes.
  • Replace any faulty sensors (e.g., MAF sensor, O2 sensor) based on the error codes.

3. Fuel System Inspection

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine.
  3. Check the fuel pressure against manufacturer specifications (typically around 50-60 PSI).
  4. If pressure is low, inspect the fuel pump and fuel filter for clogs or failure.
  5. Replace the fuel filter if it shows signs of blockage.

4. Ignition System Repair

• Sub-steps:
  1. Remove the engine cover to access the ignition components.
  2. Inspect spark plugs for fouling or excessive wear; replace if necessary.
  3. Check ignition coils for proper resistance using a multimeter; replace any defective coils.
  4. Reassemble the components and reconnect the battery.

5. Exhaust System Check

• Sub-steps:
  1. Inspect the exhaust system visually for any noticeable damage or leaks.
  2. If the catalytic converter is suspected to be clogged, perform a backpressure test.
  3. If backpressure is high, replace the catalytic converter as needed.