|Welcome to the New Hampshire OBD & Safety Testing (NHOST) Program web site!
The annual vehicle inspection process in New Hampshire includes
an On-Board Diagnostic (OBD) test along with the Safety inspection.
This website provides information to help motorists understand the
inspection process and NHOST Program.
On October 1, 2007, the state of NewHampshire transitioned into
the final stage of the OBD emission program. All automobiles and
light-duty trucks model year 1996 and newer must now pass an OBD
emission system inspection during its inspection period. Rejected
vehicles will be required to be repaired and re-tested to verify
repairs before an inspection sticker will be issued.
Vehicles must pass an emission system test to ensure they are
running as clean and efficiently as possible. This will help maintain
good air quality, making it cleaner for everyone enjoying the scenic
public ways of New Hampshire.
The impact of automobiles on air quality is clear. You can help
minimize your vehicle's contribution to the problem by keeping it
properly maintained and tuned. The New Hampshire OBD testing program
helps by notifying vehicle owners when a problem with the emission
control system is detected.