how to fix P0171 code on my BMW X5 F15 (2014-2019)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Inspect and Repair Air Intake System

• Tools Required: Screwdrivers, socket set
• Remove the engine cover (if applicable) using the socket set.
• Inspect and tighten all clamps and hoses on the air intake system.
• If any hoses or the intake manifold are damaged, replace them.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, Torx or socket set
• Disconnect the MAF sensor connector.
• Remove the MAF sensor from the air intake duct.
• Clean the sensor with MAF cleaner. If the sensor is damaged, replace it with a new one.

4. Inspect Fuel System

• Tools Required: Fuel pressure gauge, socket set
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position (without starting) and check the pressure reading. It should be within the manufacturer’s specifications.
• If the pressure is low, inspect the fuel pump and fuel filter for clogs and replace as needed.

5. Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket or wrench
• Locate the upstream oxygen sensor(s) in the exhaust system.
• Disconnect the sensor connector and unscrew the sensor using the O2 sensor socket.
• Install the new oxygen sensor, ensuring it is properly torqued and reconnect the wiring harness.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0171 code and any other related codes.
• Start the engine and allow it to reach operating temperature to monitor for any reoccurring issues.