how to solve P0171 lean code in Tesla Model 3 Original (2017-2023)

Solution

1. Preparation

• Gather necessary tools and materials.
• Disconnect the battery terminals to ensure safety.
• Allow the vehicle to cool down before starting work.

2. Inspect Air Intake System

• Remove the engine cover if necessary.
• Visually inspect all air intake hoses for cracks or loose connections.
• Use a smoke machine or soapy water to detect any leaks.
• Replace any damaged hoses or clamps.

3. Check Fuel System

• Use a fuel pressure gauge to measure fuel pressure at the rail. Ensure it meets manufacturer specifications (typically around 50-60 psi).
• If pressure is low, inspect the fuel pump and filter for blockages or malfunctions.
• Test fuel injectors with a multimeter to ensure they are functioning properly. Replace any faulty injectors.

4. Clean or Replace MAF Sensor

• Locate the MAF sensor within the air intake system.
• Carefully remove the sensor and inspect it for dirt or debris.
• Clean the sensor with MAF cleaner if dirty. Allow it to dry completely.
• Reinstall the MAF sensor and ensure all connections are secure.

5. Inspect Oxygen Sensors

• Locate the upstream oxygen sensor (pre-catalytic converter).
• Use a multimeter to test the sensor’s voltage output. It should fluctuate between 0.1V to 0.9V.
• Replace the oxygen sensor if it is faulty or out of specification.

6. Verify Engine Coolant Temperature Sensor

• Check the coolant temperature sensor with a multimeter.
• Ensure it reads within the specified range at various engine temperatures.
• Replace the sensor if it shows incorrect readings.