how to fix P0171 code in BMW X3 G01 (2018-2024)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all vacuum lines and connections for cracks or disconnections. Replace any damaged hoses.
  2. Remove the air intake duct and inspect the intake manifold gasket for any signs of wear or damage. Replace if necessary.
  3. Tighten any loose clamps on the intake system.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor connector and remove the sensor from the intake duct.
  2. Use MAF sensor cleaner to gently clean the sensor element. Allow it to dry completely.
  3. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Repair Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail and turn the ignition to the "ON" position (do not start the engine) to check fuel pressure. Refer to the manufacturer’s specifications for acceptable pressure levels.
  2. If pressure is low, inspect the fuel pump and replace it if necessary.
  3. If pressure is adequate, check fuel injectors for proper operation and clean or replace them as needed.

5. Throttle Body Cleaning

• Sub-steps:
  1. Remove the throttle body from the intake manifold by disconnecting the electrical connector and unbolting it.
  2. Clean the throttle plate and inside of the throttle body with throttle body cleaner.
  3. Reinstall the throttle body and reconnect all components.