321 Main Street Nashua New Hampshire


State Safety & Emissions Testing

Matrix Autoworks is pleased to offer this online resource with information about the State Safety & Emissions Testing program that is required for all vehicles on the roads of Nashua, Hillsborough County, and throughout the great state of New Hampshire.

When is a vehicle inspection required?

In New Hampshire, vehicle registration and inspections occur during the same month as the registered owner’s birthday. Vehicles can be inspected at any time during that month, or even 3 months prior if desired. A valid vehicle registration is required prior to the actual inspection being performed at our auto repair shop in Nashua.

Affected Vehicles

While all vehicles registered in New Hampshire require an annual safety inspection, an OBD test is required for for 1996 and newer model year gas-fueled, light-duty passenger vehicles that have a GVWR of 8,500 lbs. or less, and 1997 and newer model year light-duty passenger vehicles. Vehicles requiring the additional test are connected to an NHOST inspection machine using the vehicles OBD port. The purpose is to communicate with the OBD system of the vehicle to confirm the monitors are functioning correctly as well as detecting any other types of problems.

Vehicle Inspection Testing Stations

Every auto repair shop such as ours in Nashua is required to use equipment provided by the NHOST. Matrix Autoworks encourages anyone in need of scheduling an inspection to call our auto repair shop in Nashua to verify the fees to be charged. Our team of certified technicians take the time to explain anything needed for your vehicle to driven safely and reliably for the coming year. One should be conscientious of “low cost” inspections, as often times that automotive repair facility may not have vehicle owners best interest in and can recommend services and products that just are not necessary.

Vehicle Owner Responsibility

It is important to remember that it is the responsibility of a vehicle’s owner to make certain their car, truck, or SUV is in line with inspection requirements. In addition to fixing any safety issues before passing the inspection, one must also correct any and all problems with the OBD system prior to passing inspection and having an inspection sticker placed on the vehicle.

The primary purpose of the OBD system is to make certain the vehicle drives smoothly, releases minimal pollutants, and last longer. More times than not, fixing problems with a vehicle quickly can result in saving money on costly repairs not to mention at the gas pump as well.

Emission Testing

Beginning in the year 2005, statewide OBD II emission testing was required in New Hampshire. This new law requires all vehicles to pass the OBD II emission test to achieve a successful annual vehicle safety inspection.
An OBD II inspection is required as part of the annual New Hampshire vehicle safety inspection. When completing the safety inspection on one of our customers’ vehicles, our technician enters the results into an unit provided by the NHOST. This unit will store that vehicles test results. When a vehicle is 1996 or newer, or a light-duty truck, our technician is instructed to complete an OBD II test. This is achieved by connecting a cable to the data link connector in a vehicle resulting in the vehicle communicating with the testing equipment. Included in that data is information pertaining to the vehicle’s emission components. When finished, the NHOST unit will print a VIR (Vehicle Inspection Report) to provide details about the inspection results. Our technician wil sign the VIR and provide it as well as any other pages that are printed
The EPA (Environmental Protection Agency) Clean Air Act Amendments of 1990 included OBD II emission testing. Second generation on board diagnostics (OBD II) computers that monitor a vehicles engine’s conditions and components are required on vehicles manufactured after 1996. The purpose of the OBD II computer is to assist in make sure the engine is operating efficiently and to alert when emission control components are not working correctly and need attention. A driver is alerted by a “Check Engine Light” or “Service Engine Soon” light if there is a problem with the emission control system. Vehicles displaying one of these signals will not pass inspection.
When constantly monitoring the parts of a vehicle, the OBD system serves the purpose of identifying small issues that can be fixed easily prior to them becoming more serious and costly to repair. In addition to saving money on repairs, drivers also achieve better overall gas consumption which results in cost saving at the gas pump.
Like many components in a vehicle, OBD II systems are quite complicated. As such, it is imperative that only qualified technicians like those working at Matrix Autoworks in Nashua repair and service your vehicle. When scheduling an inspection, always ask if the technicians are ASE A-8 or L-1 certified.
Matrix Autoworks is grateful to all of those doing their part to help keep our air clean and your vehicles safe.



“I do not know how, but he worked some magic and I was on my way to see my daughter.”

Sally McBride

Hudson, NH


Up To $25 Savings
New Matrix Autoworks customers can save up to $25 off any service or repair.
Up To $25 Savings
New Matrix Autoworks customers can save up to $25 off any service or repair.
Up To $25 Savings
New Matrix Autoworks customers can save up to $25 off any service or repair.


321 Main Street Nashua NH
603 882 4888