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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical issues during repair.

2. Inspect and Replace Air Intake Components

• Inspect Hoses:
  • Check for cracks or disconnections in the intake hoses.
  • Replace any damaged hoses.
• Replace Air Filter:
  • Open the air filter housing.
  • Remove the old air filter and install a new one.

3. Clean or Replace MAF Sensor

• Remove MAF Sensor:
  • Locate and disconnect the electrical connector.
  • Unscrew the MAF sensor from the intake duct.
• Clean or Replace:
  • Clean the MAF sensor with MAF cleaner spray.
  • If damaged, replace with a new sensor and reassemble.

4. Check and Repair Vacuum Leaks

• Inspect Vacuum Lines:
  • Check all vacuum lines for cracks and wear.
  • Replace any damaged vacuum lines.
• Seal Gaskets:
  • Inspect intake manifold gaskets for leaks.
  • Replace gaskets if necessary.

5. Test and Replace Fuel Pump or Filter (if needed)

• Check Fuel Pressure:
  • Connect a fuel pressure gauge to the fuel rail.
  • Compare the pressure reading with manufacturer specifications.
• Replace Components:
  • If pressure is low, replace the fuel filter and/or fuel pump.