how to fix P0174 code in BMW 5 Series F10/F11 (2010-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
2. Use a smoke machine or carburetor cleaner to identify any leaks in the intake system.
3. Replace any damaged hoses or gaskets as needed.

3. Clean or Replace MAF Sensor

1. Locate the MAF sensor on the air intake duct.
2. Disconnect the electrical connector.
3. Remove the MAF sensor using a Torx or socket wrench.
4. Clean the MAF sensor with MAF cleaner spray; let it dry completely.
5. If damaged, replace with a new MAF sensor.
6. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel Delivery

1. Connect a fuel pressure gauge to the fuel rail.
2. Turn the ignition to the "ON" position without starting the engine and check the fuel pressure.
3. Compare the pressure reading with the manufacturer’s specifications.
4. If the pressure is low, inspect the fuel pump, fuel filter, and fuel injectors for proper operation.
5. Replace any faulty components.

5. Inspect Intake Manifold

1. Remove the engine cover to access the intake manifold.
2. Check the intake manifold gaskets for wear or damage.
3. If leaks are detected, remove the intake manifold and replace the gaskets.
4. Reinstall the intake manifold, ensuring all bolts are torqued to the manufacturer’s specifications.