how to fix P0174 code in Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0174 system too lean 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.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers
• Remove the engine cover (if applicable) using a socket set.
• Inspect all air intake hoses and connections for cracks or loose fittings.
• Replace any damaged hoses and ensure all connections are tight.

3. Fuel System Inspection

• Tools Required: Fuel pressure gauge
• Locate the fuel rail and attach the fuel pressure gauge.
• Turn the ignition to the "On" position (do not start the engine) to check the fuel pressure.
• If fuel pressure is below specifications, consider replacing the fuel pump or fuel filter.

4. MAF Sensor Cleaning

• Tools Required: MAF cleaner
• Disconnect the MAF sensor electrical connector.
• Remove the MAF sensor from the intake system.
• Spray MAF cleaner onto the sensor element and allow it to air dry completely before reinstallation.

5. Fuel Injector Inspection

• Tools Required: Fuel injector cleaner or replacement
• Remove the fuel rail to access the fuel injectors.
• Inspect each injector for signs of clogging or leakage.
• Clean the injectors using a fuel injector cleaning kit or replace them if necessary.

6. Oxygen Sensor Check

• Tools Required: Multimeter
• Locate the oxygen sensors and disconnect their electrical connectors.
• Use a multimeter to test the voltage output of the sensors; compare readings to manufacturer specifications.
• Replace any faulty oxygen sensors as needed.