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

Learn how to diagnose and fix P0174 engine too lean issue 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 parked on a level surface, and the engine is cool.
• Disconnect the battery to avoid electrical issues during repairs.

2. Inspect Air Intake System

• Tools Required: Screwdriver set, flashlight
• Remove the engine cover (if applicable) using the screwdriver.
• Inspect all hoses and connections in the air intake for cracks, breaks, or improper fittings.
• Tighten any loose clamps and replace damaged hoses.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner (non-residue), Torx or socket set
• Disconnect the MAF sensor electrical connector.
• Remove the MAF sensor from the air intake.
• Clean the sensor with MAF cleaner according to the manufacturer’s instructions or replace it if damaged.
• Reinstall the sensor and reconnect the electrical connector.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge, safety goggles
• Locate the fuel pressure test port on the fuel rail.
• Connect the fuel pressure gauge and turn the ignition to the "ON" position without starting the engine.
• Check the fuel pressure reading against the manufacturer specifications. If low, check the fuel pump and filter.
• If necessary, replace the fuel filter or fuel pump.

5. Inspect Fuel Injectors

• Tools Required: Fuel injector cleaning kit (if needed), multimeter
• Disconnect the fuel injector connectors.
• Use a multimeter to check the resistance of each injector according to specifications.
• If an injector is found faulty, replace it with a new one.