how to fix P0171 code in BMW X5 G05 (2019-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake System

• Step 1: Visually inspect all air intake hoses and connections for cracks or loose fittings.
• Step 2: Replace any damaged hoses or gaskets.
• Step 3: Ensure the intake manifold is properly secured without leaks.

3. Clean or Replace MAF Sensor

• Step 1: Locate the MAF sensor on the air intake duct.
• Step 2: Disconnect the electrical connector and remove the MAF sensor.
• Step 3: Clean the sensor with MAF sensor cleaner; if it's damaged, replace it with a new one.
• Step 4: Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel System

• Step 1: Connect a fuel pressure gauge to the fuel rail.
• Step 2: Turn the ignition to the "On" position without starting the engine and check fuel pressure against manufacturer specifications (should be around 50-60 psi).
• Step 3: If pressure is low, check the fuel pump and replace if necessary.
• Step 4: Inspect fuel injectors for clogs or malfunctions; clean or replace as needed.

5. Inspect Exhaust System

• Step 1: Visually inspect the exhaust system for leaks, particularly before the oxygen sensor.
• Step 2: If leaks are found, repair or replace affected sections of the exhaust.

6. Reconnect Battery and Clear Codes

• Reconnect the battery.
• Use the OBD-II scanner to clear the P0171 code from the system.