my Tesla Outback’s fuel economy has dropped suddenly, why

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Air Filter

• Sub-steps:
  • Locate the air filter housing.
  • Remove the screws or clips securing the housing cover.
  • Take out the old air filter and inspect for dirt and debris.
  • Install a new air filter (ensure it matches specifications).
  • Reassemble the housing cover and secure it.

3. Clean or Replace Fuel Injectors

• Sub-steps:
  • Relieve fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls.
  • Disconnect the fuel lines from the injectors, taking care to catch any residual fuel.
  • Remove injectors and clean them using a fuel injector cleaning kit or replace them if necessary.
  • Reinstall injectors, reconnect fuel lines, and ensure there are no leaks.

4. Check and Replace Spark Plugs

• Sub-steps:
  • Remove the ignition coil or plug wires attached to each spark plug.
  • Use a spark plug socket to remove each spark plug.
  • Inspect spark plugs for wear or fouling and replace if necessary.
  • Torque new spark plugs to the manufacturer's specifications.

5. Verify Fuel Pump Operation

• Sub-steps:
  • Reconnect the fuel pump fuse and turn the ignition to the "ON" position (do not start).
  • Use a fuel pressure gauge to check the pressure at the fuel rail.
  • If pressure is low, replace the fuel pump according to manufacturer's specifications.