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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, flashlight.
• Sub-steps:
  1. Visually inspect the air intake hoses for cracks or damage.
  2. Tighten any loose clamps and connections.
  3. If leaks are found, replace the damaged hoses or gasket.

3. Check and Replace MAF Sensor (if necessary)

• Tools Required: Torx screwdriver, cleaning spray (if cleaning), new MAF sensor (if replacement is needed).
• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the intake system.
  3. Clean the MAF sensor with appropriate cleaner or replace it if it’s defective.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Fuel System Inspection

• Tools Required: Fuel pressure gauge, socket set.
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position (do not start) to check the fuel pressure.
  3. Compare the reading to manufacturer specifications; replace the fuel pump if low.
  4. Inspect fuel injectors for clogs or leaks, replacing them if needed.

5. Final Assembly

• Reinstall any components removed during the repair.
• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.