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

Solution

1. Preparation

• Gather all necessary tools and parts before starting.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down if it has been running.

2. Inspect and Repair Intake System

• Sub-steps:
  1. Visually inspect all intake hoses and connections for cracks or loose fittings.
  2. Tighten any loose clamps or replace damaged hoses.
  3. If leaks are found, replace the affected components.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the wiring harness from the MAF sensor.
  3. Remove the MAF sensor using a Torx screwdriver.
  4. Clean the MAF sensor with MAF sensor cleaner or replace it if damaged.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  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. If the pressure is below specifications, check the fuel pump and filter for faults, and replace as necessary.

5. Inspect and Replace O2 Sensors

• Sub-steps:
  1. Locate the oxygen sensors in the exhaust system.
  2. Disconnect the electrical connectors from the O2 sensors.
  3. Use an O2 sensor socket to remove the sensors from the exhaust.
  4. Install new O2 sensors and reconnect the electrical connectors.