my Tesla Model S Original (2012-2020) has a P0171 code, what does that mean?

Learn how to diagnose and fix P0171 lean fuel condition in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is on a flat surface, and the engine is cool.
• Disconnect the negative battery terminal to avoid electrical shock.

2. Inspect Intake System

• Tools Required: Vacuum gauge, flashlight
• Visually inspect all vacuum hoses for cracks or disconnections.
• Use a vacuum gauge to test the intake manifold vacuum. Normal range is typically 18-22 inHg at idle.
• Replace any damaged hoses or gaskets.

3. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel rail and connect the fuel pressure gauge.
• Turn the ignition to the "ON" position without starting the engine to check the pressure.
• Compare the reading to the manufacturer’s specifications (usually between 43-55 psi).
• If pressure is low, inspect the fuel pump and filter for blockages or failures.

4. Inspect MAF Sensor

• Tools Required: MAF cleaner or electrical contact cleaner
• Disconnect the MAF sensor connector and remove the sensor from the intake.
• Clean the sensor using MAF cleaner and let it dry.
• Reinstall the sensor and reconnect the connector.

5. Check Fuel Injectors

• Tools Required: Multimeter, fuel injector cleaning kit (optional)
• Inspect the wiring and connectors for the fuel injectors.
• Use a multimeter to check the resistance of each injector (specifications are typically around 12-16 ohms).
• If an injector is faulty, replace it.

6. Verify Coolant Temperature Sensor

• Tools Required: Multimeter
• Locate the coolant temperature sensor and disconnect it.
• Use a multimeter to check the resistance and compare it to manufacturer specifications.
• Replace the sensor if it is out of range.