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

Learn how to diagnose and fix P0174 engine too lean condition in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the vehicle's battery to ensure safety during repairs.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, wrench set
• Instructions:
  1. Use the vacuum gauge to check for leaks in the intake system.
  2. Inspect all vacuum hoses for cracks or disconnections.
  3. Replace any damaged hoses or gaskets found during inspection.

3. Fuel Pressure Check

• Tools Required: Fuel pressure gauge
• Instructions:
  1. Locate the fuel rail and attach the fuel pressure gauge to the service port.
  2. Turn on the ignition (do not start the engine) to check the pressure reading.
  3. Compare the reading to the manufacturer’s specifications; if it is low, replace the fuel pump or regulator.

4. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, screwdriver set
• Instructions:
  1. Disconnect the electrical connector on the MAF sensor.
  2. Remove the MAF sensor from the intake duct.
  3. Clean the MAF sensor with MAF cleaner; allow it to dry completely.
  4. If the sensor is damaged, replace it with a new one.

5. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set
• Instructions:
  1. Locate the downstream oxygen sensor for bank 2.
  2. Disconnect the wiring harness and use the O2 sensor socket to remove the sensor.
  3. Install the new oxygen sensor and reconnect the wiring.

6. Check Fuel Injectors

• Tools Required: Fuel injector cleaner, multimeter
• Instructions:
  1. Remove the fuel rail to access the injectors.
  2. Test each injector's resistance using a multimeter to ensure they are within specification.
  3. Clean or replace any faulty injectors.