Inspection Results and Sticker Recieved
|Safety Result||OBD Result||Sticker Portions Isssued|
|Pass||Pass||Complete Inspection Sticker|
|Pass||Reject||Month Portion Only|
The final transition of the NHOST Program was completed as of October 1, 2007.
All automobiles and light-duty trucks model-year
1996 or later are subject to Pass or Fail for OBD emissionsinspection. This helps ensure that
the vehicles on the roads in New Hampshire will be running cleanly and efficiently in accordance with the
US Environmental Protection Agency regulations and keeping our environment and air quality healthier for us all.
The windshield stickering process that was implemented on December 1,
2006 now applies to all 1996 and newer vehicles that require an OBD inspection. Depending on the result of
the safety and OBD inspections, a vehicle will receive the whole windshield sticker, no change to the current windshield sticker
or a partial windshield sticker, as shown in the table to the right.
The OBD system test consists of several individual checks. Failing any one of the tests will result in an
overall failure of that vehicle for the emission portion of the NHOST inspection.
This is checked manually by the mechanic. The Malfunction Indicator Light, or MIL, should illuminate
when the ignition is in the Key On, Engine Off (KOEO) position, often labeled as the Run position. If
your MIL light fails to light it could indicate that the OBD system is not functioning, that the MIL
bulb is not working, or that the system wiring is damaged.
This check is also performed by the mechanic. The Diagnostic Link Connector (DLC) is the port into
which the NHOST inspection unit connects when performing the OBD test. The port, which is standardized
and required on all 1996 and newer passenger vehicles that have a gross vehicle weight rating (GVWR) of
8500 lbs or less, is usually located under the dashboard on the driver's side. If the DLC port has been
cut out, stuffed behind something so it is inaccessible or has otherwise been damaged so that the
inspection equipment cannot connect to it, the vehicle will fail the OBD test.
The NHOST inspection unit automatically performs this check, which simply ensures that the inspection
equipment is able to read the OBD system monitors. If it is unable to properly communicate with the
vehicle, there is a problem with the OBD connection or system that needs to be addressed.
This check tests to see if the vehicle has gone through the proper drive cycle(s) to be ready for
testing. A drive cycle is a particular series of events that need to occur for the monitors to properly
evaluate how the vehicle is performing. For example, part of a drive cycle might be driving at 40 mph
for 5 minutes, idling for 15 seconds and driving in stop and go traffic for 15 minutes. Check your
owner's manual. Each manufacturer has their own drive cycle and vehicle makes produced by the same
manufacturer may even have some variation. Most people will complete the drive cycle for their vehicle
in no more than three days just by using their normal driving routine. Vehicles that are only driven
for short distances or at low speeds may take longer to complete their drive cycle and/or require
special operation such as at higher speeds.
Issues with completed drive cycles prior to the NHOST inspection are typically only of concern when the
OBD system has been "cleared" to remove previously recorded DTCs. This would be done when a previous
problem was corrected and the mechanic cleared the OBD system after making the needed repairs so that
the check engine light would no longer illuminate. Unless you have had recent work done that required
this clearing, your monitors should all be ready. If there are monitors that are not ready, however,
the vehicle will not pass the OBD test.
This is an electronic check that has two purposes. First it is a deterrent against someone improperly
tampering with the OBD system in an attempt to obtain a passing test when the vehicle has OBD defects.
Second, if the MIL is commanded on and DTCs are present, it indicates a serious problem with the
vehicle. If the MIL is commanded on for whatever reason, the vehicle will fail the OBD test.
This test is a visual check performed by the mechanic if the NHOST inspection unit is unable to
communicate with the vehicle as described above. It is used as a catch-all check in case the other
above checks cannot be performed. If the MIL light is on while the engine is running, the vehicle will
fail this check.
At the end of an emission test, the Gordon-Darby OBD inspection machine will print out a Vehicle
Inspection Report, or VIR. The station should present this VIR to you as it is designed to let the
motorist see the results of the inspection including whether or not the vehicle was passed or rejected.
If it was rejected, it will list the reasons why it was rejected. We recommend you keep the VIR in your
vehicle as added proof that you have recieved a proper vehicle inspection.Click here for more VIR Details
If your vehicle was rejected, you will need to have proper repairs made. A diagnostic evaluation is the
first step. Be sure that your vehicle is diagnosed and repaired by a qualified OBD trained technician.
Generally, people who are qualified to diagnose and repair OBD are ASE L-1 certified. Your vehicle may be
eligible for warranty repair under your vehicle emissions warranty or the federal 8/80 warranty. Also,
check for recall notices or technical service bulletins prior to authorizing repairs. Consult your vehicle
owner's manual or dealer.
If you believe that your vehicle should not have been rejected for the OBD inspection, you may request a
Referee Action withing 10 days of the failed OBD inspection. Do not have any repairs made to your vehicle
prior to contacting the NHOST Helpline. Your inspection results will be evaluated to determine if your
vehicle qualifies for Referee Action.
Of all the vehicles on the road today, the vast majority will pass an OBD emission test. If you properly
maintain your vehicle on an ongoing basis your vehicle will most likely pass smoothly through that portion
of the inspection. But, if you are one of the few whose vehicle has an OBD issue, here is some information
about what that means for your annual inspection.
A rejection indicates that a problem exists that could compromise the efficiency and smooth operation of
your vehicle. Rejected vehicles must be repaired and pass the inspection before an inspection sticker will
be issued. A one time 60-day repair period will be allowed to have necessary diagnostics and repairs
performed, and the vehicle re-tested to verify repairs.