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.
• Disconnect the vehicle's battery to ensure safety.
• Allow the vehicle's engine to cool.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and intake manifold gaskets for signs of wear, cracks, or damage.
  2. Use a smoke machine or carb cleaner to check for leaks by applying smoke or spray around suspected areas.
  3. Replace any damaged hoses or gaskets found.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the intake system.
  2. Disconnect the electrical connector from the MAF sensor.
  3. Remove the MAF sensor using a Torx screwdriver.
  4. Clean the sensor with MAF cleaner spray; do not use other cleaners.
  5. Reinstall the MAF sensor and reconnect the connector (or replace it if necessary).

4. Check Fuel Delivery System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "On" position (do not start the engine) and check the fuel pressure reading against the manufacturer's specifications.
  3. If pressure is low, replace the fuel pump or fuel filter as needed.

5. Inspect Oxygen Sensors

• Sub-steps:
  1. Locate the upstream oxygen sensors (pre-catalytic converter).
  2. Check the wiring and connectors for damage or corrosion.
  3. Use a multimeter to test the sensor's resistance or voltage output (refer to specifications for values).
  4. Replace any faulty oxygen sensors.