my BMW X3 G01 (2018-2024) has a check engine light and code P0174

Solution

1. Preparation

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

2. Inspect Air Intake System

• Tools Required: Socket set, screwdrivers, flashlight.
• Sub-steps:
  1. Remove the air intake duct.
  2. Inspect for cracks or loose connections.
  3. Repair or replace any damaged components as necessary.

3. Check Fuel Delivery

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine and check for proper fuel pressure (usually between 50-60 psi for BMW).
  3. If pressure is low, inspect the fuel pump and filter for issues and replace as necessary.

4. Inspect MAF Sensor

• Tools Required: MAF sensor cleaner or electrical cleaner.
• Sub-steps:
  1. Locate the MAF sensor in the air intake system.
  2. Disconnect the electrical connector.
  3. Remove the MAF sensor and clean it using the MAF cleaner.
  4. Reinstall the sensor and connector.

5. Check for Exhaust Leaks

• Tools Required: Exhaust smoke tester (if available).
• Sub-steps:
  1. Inspect the exhaust manifold and pipe connections.
  2. Use the smoke tester to identify any leaks in the exhaust system.
  3. Repair or replace any damaged exhaust components.

6. Replace Components as Needed

• If any defective components were identified (e.g., MAF sensor, fuel pump), replace them accordingly.