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

Solution

1. Preparation

• Gather necessary tools and parts.
• Make sure the vehicle is parked on a level surface.
• Disconnect the negative battery terminal to avoid electrical issues.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, screwdriver set
• Check all vacuum hoses for cracks or disconnections. Replace any damaged hoses.
• Inspect the intake manifold gaskets. Replace them if there is any sign of wear or damage.
• Use a vacuum gauge to confirm proper vacuum levels; address any issues found.

3. Clean or Replace Mass Airflow Sensor

• Tools Required: MAF cleaner, screwdriver set
• Remove the MAF sensor from the intake system.
• Spray the MAF cleaner onto the sensor elements, avoiding direct contact with the electrical connections.
• Allow the sensor to dry before re-installing it. If damaged, replace with a new sensor.

4. Check Fuel System

• Tools Required: Fuel pressure gauge, socket set
• Connect the fuel pressure gauge to the fuel rail and check the pressure against the manufacturer specifications.
• If the pressure is low, inspect the fuel pump, filter, and injectors for blockages or failure. Replace as necessary.

5. Inspect Oxygen Sensors

• Tools Required: O2 sensor socket, multimeter
• Disconnect the oxygen sensors and test their voltage output with a multimeter. Ensure they are within specifications.
• Replace any faulty sensors with OEM parts.

6. Throttle Body Cleaning

• Tools Required: Throttle body cleaner, screwdriver set
• Remove the throttle body from the intake manifold.
• Clean the throttle plate and bore with throttle body cleaner and a soft cloth.
• Reinstall the throttle body, ensuring all connections are secure.