July 2, 2012


This is a reminder to all inspecting mechanics and stations that tampering with the On-Board Diagnostics of a vehicle is not permitted for any reason. OBD tampering is subject to state and federal criminal charges as well as administrative hearing.

Saf-C 3222.04 Tampering With the Emission Control System of a Vehicle.
(a) For the purposes of this section, “tamper with” means to permanently remove, bypass, defeat, or otherwise render inoperable, any portion of an emission control system, including software, that is installed in or on a motor vehicle.
(b) If, during a safety inspection or OBD inspection, a mechanic determines that any portion of an emission control system has been tampered with pursuant to (a) above, the mechanic shall report, in writing, the details of such tampering to the department.
(c) Upon receipt of a report pursuant to (b) above, the department shall notify the EPA for any action it deems appropriate.
(d) If a mechanic tampers with any portion of an emission control system pursuant to (a) above, the mechanic shall be subject to an administrative hearing pursuant to RSA 266:1, XI(a) and PART Saf-C 3248.

State authorized mechanics are responsible to be familiar with and comply with all motor vehicle inspection rules and laws. These rules and laws are available for review on your NHOST unit in the “Information and Training Materials” menu.

If you have any questions, please contact the Division of Motor Vehicles at 227-4120.