How do you tell if your Volvo 740 is a Regina or bosch electric system?

To determine whether your Volvo 740 has a Regina or Bosch fuel injection system, check the engine compartment for the fuel injection system's identifying features. The Bosch system typically has a more complex wiring harness and is often equipped with a black plastic air flow meter, while the Regina system has a simpler design with fewer components and may have a metal air flow meter. Additionally, you can look for the part numbers on the fuel injectors or consult the vehicle's VIN, which may provide clues about the system used.