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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety during the repair process.

2. Inspect and Repair Intake System

• Sub-steps:
  • Visually inspect all hoses connected to the intake manifold for cracks or disconnections.
  • Use a smoke machine to check for vacuum leaks if necessary.
  • Replace any damaged hoses or gaskets.
• Tools Required: Smoke machine, basic hand tools.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor on the intake duct.
  • Disconnect the electrical connector and remove the sensor.
  • Clean the sensor with MAF cleaner or replace it if damaged.
  • Reinstall the sensor and reconnect the electrical connector.
• Tools Required: MAF cleaner, Torx or socket set.

4. Check Fuel Pressure

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "ON" position without starting to check for initial pressure.
  • Start the engine and observe pressure; it should match manufacturer specifications (generally between 50-60 psi for many models).
  • If pressure is low, check the fuel pump and filter.
• Tools Required: Fuel pressure gauge.

5. Inspect Bank 2 Fuel Injectors

• Sub-steps:
  • Remove the engine cover if applicable to access the fuel injectors.
  • Disconnect the electrical connectors from the fuel injectors on Bank 2.
  • Perform a resistance test on the injectors with a multimeter; replace any injectors that are out of specification.
  • Reinstall all components and reconnect the battery.
• Tools Required: Multimeter, basic hand tools.