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

Solution

1. Preparation

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

2. Inspect and Replace Vacuum Hoses

• Tools Required: Pliers, replacement vacuum hoses
• Sub-steps:
  1. Visually inspect all vacuum hoses for cracks, leaks, or disconnections.
  2. Replace any damaged hoses with new ones, ensuring proper routing and fitting.

3. Clean or Replace the MAF Sensor

• Tools Required: MAF cleaner, screwdriver
• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. Clean the sensor with MAF cleaner, allowing it to dry completely.
  4. Reinstall the sensor and reconnect the electrical connector.

4. Test and Replace Fuel Filter (if necessary)

• Tools Required: Fuel pressure gauge, socket set
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition on (without starting the engine) and check the pressure reading.
  3. If the pressure is low, inspect and replace the fuel filter per manufacturer specifications.

5. Inspect and Clean Throttle Body

• Tools Required: Throttle body cleaner, socket set, rags
• Sub-steps:
  1. Remove the intake duct from the throttle body.
  2. Spray throttle body cleaner onto a rag and wipe the throttle body opening to remove carbon buildup.
  3. Open the throttle plate manually to clean the interior surfaces.
  4. Reassemble the intake duct securely.