How do states use OBD II for emission inspections?

Many states connect a computer directly to a vehicle's OBD II system. The inspector can then read "faults." In some states, this type of inspection has replaced the tailpipe emission test.
See also:
Rollover Protection System (ROPS)
Volvo’s Rollover Protection System utilizes the
Roll Stability Control (RSC) function, which is
designed to help minimize the risk of a rollover
in emergency maneuvers or if a skid should
occu ...
When does BLIS function
The system functions when your vehicle is
moving at speeds above 6 mph (10 km/h).
When you pass another vehicle:
The system reacts when you pass another
vehicle at a speed of up to 6 mph (10 km/ ...
Introduction
The park assist system is designed to assist
you when driving into parking spaces, garages,
etc. It utilizes ultrasound sensors in the front
bumper and rear bumper(s) to measure the distance
t ...
