how to fix P0174 code in Tesla Model S Plaid/Refresh (2021-present)

Learn how to diagnose and fix P0174 engine too lean issue in Tesla Model S Plaid. 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 ensure safety while working on the electrical components.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, hose clamps, screwdriver
• Steps:
  1. Visually inspect all intake hoses and connections for cracks or loose fittings.
  2. Tighten or replace any loose or damaged clamps and hoses.
  3. Replace the air filter if it is dirty or clogged.

3. Clean MAF Sensor

• Tools Required: MAF sensor cleaner
• Steps:
  1. Locate the MAF sensor in the intake path.
  2. Carefully disconnect the electrical connector from the MAF sensor.
  3. Remove the MAF sensor from the housing.
  4. Spray the sensor with MAF cleaner and allow it to dry completely before reinstalling.

4. Inspect and Test Fuel Delivery

• Tools Required: Fuel pressure gauge, multimeter
• Steps:
  1. Connect a fuel pressure gauge to the fuel rail and turn the ignition to the "ON" position without starting the engine to check fuel pressure.
  2. Compare the reading to manufacturer specifications.
  3. If pressure is low, inspect the fuel pump and filter for blockages or failures. Replace as necessary.

5. Check and Replace Oxygen Sensors (if necessary)

• Tools Required: Socket set, oxygen sensor socket
• Steps:
  1. Locate the downstream oxygen sensor for Bank 2.
  2. Disconnect the electrical connector and use the sensor socket to remove the old sensor.
  3. Install the new oxygen sensor and reconnect the electrical connector.