how to diagnose the P0171 code in my BMW X3 G01 (2018-2024)?

Safety Warnings

• ⚠Safety Warnings:** Disconnect the battery before working on electrical systems and allow the engine to cool.
• ⚠Inspect all vacuum hoses for cracks or disconnections and replace any faulty hoses.
• ⚠Check the intake manifold for any signs of leaks; use a vacuum gauge to test for vacuum integrity.
• ⚠Tighten or replace clamps as necessary to ensure a secure fit.
• ⚠Remove the MAF sensor from the air intake duct.
• ⚠Use MAF cleaner to clean the sensor elements carefully; allow it to dry completely before reinstallation.
• ⚠Reinstall the MAF sensor ensuring it is secured properly.
• ⚠Connect a fuel pressure gauge to the fuel rail and turn the ignition on (do not start the engine); record the pressure reading.
• ⚠If pressure is below specifications (typically 50-60 psi for BMW), check the fuel pump and fuel filter for issues.
• ⚠Replace the fuel filter if clogged and test the fuel pump operation.
• ⚠Remove the fuel rail to access the injectors.
• ⚠Check for leaks and proper operation by using a noid light or injector tester.
• ⚠Clean or replace any clogged or faulty fuel injectors.
• ⚠Clear the P0171 code using the OBD-II scanner.
• ⚠Test drive the vehicle to ensure the engine operates smoothly without any warning lights.
• ⚠Monitor fuel trims with a scanner; they should remain within normal parameters (typically between -10% to +10%).
• ⚠Check for any reoccurrence of the P0171 code after the repair.
• ⚠Regularly check and replace air filters as needed.
• ⚠Follow the manufacturer’s maintenance schedule for fuel system cleaning.
• ⚠Use high-quality fuel to prevent injector clogging.
• ⚠Perform routine inspections of vacuum lines and intake components.