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

Learn how to diagnose and fix P0174 engine 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.
• Disconnect the vehicle's 12V battery to prevent electrical shocks.
• Ensure the vehicle is on a flat surface and is securely supported if elevated.

2. Inspect and Repair Air Intake System

• Sub-steps:

  • Remove the engine cover if applicable.
  • Visually inspect all intake hoses and gaskets for cracks or disconnections.
  • Tighten any loose clamps or replace damaged hoses.

• Tools Required: Socket set, screwdrivers.

3. Test and Clean MAF Sensor

• Sub-steps:

  • Disconnect the electrical connector from the MAF sensor.
  • Remove the MAF sensor from the air intake duct.
  • Clean the MAF sensor with MAF cleaner spray and let it dry completely.
  • Reinstall the MAF sensor and reconnect the electrical connector.

• Tools Required: Torx screwdriver, MAF cleaner spray.

4. Check and Replace Oxygen Sensors (if necessary)

• Sub-steps:

  • Locate the oxygen sensors (pre-catalytic converters on bank 2).
  • Disconnect the electrical connectors.
  • Use an O2 sensor socket to remove the old sensors.
  • Install new oxygen sensors and reconnect the electrical connectors.

• Tools Required: O2 sensor socket, ratchet.

5. Fuel System Check

• Sub-steps:

  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition key to the "ON" position without starting the engine to check fuel pressure.
  • Compare the reading with the specifications (typically around 50-60 PSI for most vehicles; consult the Tesla service manual for precise values).
  • If low, inspect the fuel pump and filter for issues and replace if necessary.

• Tools Required: Fuel pressure gauge, line wrenches.