what does it mean if my Tesla Model 3 Highland (2024-present) shows error code P0171

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the vehicle's battery to prevent any electrical shorts.
• Ensure the engine is cool before proceeding with repairs.

2. Inspect and Repair Air Intake System

1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
2. Replace any damaged hoses or connectors.
3. If the ducting is damaged, replace with OEM equivalent parts.

3. Clean or Replace MAF Sensor

1. Disconnect the MAF sensor electrical connector.
2. Remove the MAF sensor from the intake duct.
3. Use MAF cleaner to spray the sensor element and allow it to dry completely.
4. Reinstall the sensor and reconnect the electrical connector.

4. Check and Adjust Fuel Pressure

1. Connect a fuel pressure gauge to the fuel rail service port.
2. Turn the ignition to the "ON" position without starting the engine and check the fuel pressure reading.
3. If the pressure is below specifications, inspect the fuel pump and fuel filter for issues. Replace if necessary.

5. Inspect Fuel Injectors

1. Remove the fuel rail to access the fuel injectors.
2. Inspect each injector for clogs or leaks. Clean or replace as necessary.
3. Reinstall the fuel rail ensuring proper alignment and torque specifications.

6. Test Engine Coolant Temperature Sensor

1. Disconnect the sensor connector and use a multimeter to check resistance.
2. Compare the readings with manufacturer specifications. Replace the sensor if it is out of range.
3. Reconnect the sensor and ensure the wiring harness is intact.