how to fix P0174 code in my BMW 5 Series G30/G31 (2017-2024)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, screwdriver.
• Sub-steps:
  1. Use a vacuum gauge to check for leaks in the intake system.
  2. Inspect all vacuum hoses for cracks or disconnections.
  3. Replace any damaged hoses and re-secure loose connections.

3. Fuel System Check

• Tools Required: Fuel pressure gauge, socket set.
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail’s test port.
  2. Start the engine and observe the pressure reading; it should meet manufacturer specifications (typically 50-60 psi).
  3. If pressure is low, check the fuel pump and filter; replace as needed.

4. MAF Sensor Cleaning/Replacement

• Tools Required: MAF cleaner, screwdriver.
• Sub-steps:
  1. Locate and unplug the MAF sensor.
  2. Remove the MAF sensor from the intake.
  3. Clean the sensor with MAF cleaner, following the product’s instructions.
  4. Reinstall the sensor, ensuring all connections are secure.

5. Inspect and Repair Fuel Injectors

• Tools Required: Multimeter, socket set.
• Sub-steps:
  1. Remove the fuel rail to access the fuel injectors.
  2. Use a multimeter to check the resistance of each injector (typically 12-16 ohms).
  3. Replace any faulty injectors and reassemble the fuel rail.