Which model year vehicles must receive a Low-Pressure Fuel Evaporative Test (LPFET) during a Smog Check?

The requirement for a Low-Pressure Fuel Evaporative Test (LPFET) during a Smog Check is specifically designed to address the emissions control systems in vehicles. In this context, vehicles from the 1995 model year and older typically utilize systems that are less advanced and do not incorporate the same stringent evaporative emissions controls found in more modern vehicles.

The LPFET targets the evaporative emissions control systems, which are essential for preventing fuel vapors from escaping into the atmosphere. Since vehicles from 1995 and older often lack the sophisticated systems installed in later models, they are subjected to this test to ensure that their simpler systems are functioning as intended and do not leak harmful vapors.

In contrast, vehicles from the 1996 model year and newer have more advanced emissions control technologies in place, including enhanced evaporative systems that are evaluated through different testing protocols. Therefore, the testing criteria vary based on model years, and the focus shifts for newer vehicles, which might be subjected to different standards and tests.