how to fix P0171 lean code on my Tesla Outback 6th Generation (2020-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down before starting.

2. Inspect and Repair Vacuum Leaks

• Visually inspect all vacuum hoses connected to the intake manifold.
• Use a smoke machine to identify leaks by introducing smoke into the intake system.
• Replace any damaged or cracked hoses.

3. Check and Clean MAF Sensor

• Locate the MAF sensor (usually between the air filter and throttle body).
• Disconnect the electrical connector and remove the MAF sensor carefully.
• Clean the sensor using MAF cleaner spray and a soft brush if necessary.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Test and Adjust Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the ON position (without starting) to prime the fuel system and check the pressure reading.
• If fuel pressure is below specifications, inspect the fuel pump and filter for issues and replace them if necessary.

5. Inspect and Test Fuel Injectors

• Remove the fuel rail to access the injectors.
• Check for leaks or blockages in the fuel injectors.
• Clean injectors with a professional cleaning kit or replace if they are faulty.

6. Replace Oxygen Sensors (if necessary)

• If oxygen sensors are found to be malfunctioning, locate the upstream sensor for bank 1.
• Disconnect the electrical connector and unscrew the sensor from the exhaust manifold.
• Install a new oxygen sensor, ensuring to use anti-seize compound on the threads.
• Reconnect the electrical connector.