Many states require that your vehicle undergo either a safety inspection or an emission controls system inspection. Sometimes both. If your car or truck has failed inspection, you are probably frustrated. The first thing you need to do is to read up on your state's laws and procedures for failing the test. It varies from state to state. It could be that you failed because of something as simple as a dangling muffler.

Whether your car's OBD system is showing a fault code or your check engine light caused you to fail, you need to know what to expect when you bring the car back. Also, if you are buying a car it is a good idea to find out whether your state requires inspections. Many states have no inspection requirement at all. Use the links below to find out the specifics of your state's inspection situation, and get your car back on the road!

Following is a list of states and links to contact information pertaining to each state's vehicle emissions testing or safety inspection requirements:

Alabama - No Testing Required - for more info visit http://ador.alabama.gov/motorvehicle/registration_faq.html#RegFAQ4

Alaska - Testing No Longer Required - for more info visit http://www.doa.alaska.gov/dmv/dealer/sop_reg/R430_emission_insp.htm

Arizona - for more info visit http://www.azdeq.gov/environ/air/vei/

Arkansas - for more info visit http://www.adeq.state.ar.us/air/ozone/cars.htm

California - for more info visit http://www.smogcheck.ca.gov/

Colorado - for more info visit http://www.aircarecolorado.com/

Connecticut - for more info visit http://www.ctemissions.com/

Delaware - for more info visit http://www.dmv.de.gov/services/vehicle_services/reg/ve_reg_emissions.shtml

Florida - Testing No Longer Required - for more info visit http://www.flhsmv.gov/offices/

Georgia - for more info visit http://www.cleanairforce.com/

Hawaii - for more info visit http://www.dmv.org/hi-hawaii/car-registration.php

Idaho - Testing Required Only in Ada County - for more info visit http://www.emissiontest.org/

Illinois - for more info visit http://www.epa.state.il.us/air/vim

Indiana - for more info visit http://www.in.gov/bmv/2665.htm

Iowa - No Testing Required

Kansas - No Testing Required

Kentucky - No Testing Required

Louisisana - for more info visit http://www.lsp.org/lse_form4.html

Maine - for more info visit http://www.maine.gov/dep/air/mobile/enhancedautoinsp.html

Maryland - for more info visit http://www.mva.maryland.gov/MVA-Programs/VEIP/veipinfo.htm

Massachusetts - for more info visit http://www.mass.gov/rmv/stations

Michigan - No Testing Required

Minnesota - No Testing Required

Mississippi - for more info visit http://www.dps.state.ms.us/driver-services/new-drivers-license/motor-vehicle-inspections/

Missouri - for more info visit http://www.dnr.mo.gov/gatewayvip

Montana - No Testing Required

Nebraska - for more info visit www.dmv.ne.gov/dvr/mvtitles/inspect.html

Nevada - Some Areas Require Testing - for more info visit http://www.dmvnv.com/emission_areas.htm

New Hampshire - for more info visit http://www.nh.gov/safety/divisions/dmv/registration/inspections-emissions/index.htm

New Jersey - for more info visit http://www.cabq.gov/aircare

New York - for more info visit https://apps.dot.state.nc.us/dmv/emissions

North Dakota - No Testing Required

Ohio - for more info visit http://epa.ohio.gov/dapc/echeck/testing_info/tips_for_smooth_testing.aspx

Oklahoma - No Testing Required

Oregon - for more info visit http://www.deq.state.or.us/aq/vip/stations.htm

Pennsylvania - for more info visit http://www.drivecleanpa.state.pa.us/

Rhode Island - for more info visit http://www.dmv.ri.gov/inspections

South Carolina - No Testing Required

South Dakota - No Testing Required

Tennessee - for more info visit http://www.state.tn.us/environment/apc/vehicle

Texas - for more info visit http://www.txdps.state.tx.us/rsd/vi/consumerinfo/emissionTesting.htm

Utah - for more info visit http://dmv.utah.gov/safety-and-emissions-inspections#emission

Vermont - for more info visit http://dmv.vermont.gov/safety/laws/emissions

Virginia - for more info visit http://www.dmv.virginia.gov/webdoc/citizen/vehicles/emissions.asp

Washington - for more info visit http://www.dol.wa.gov/vehicleregistration/emissions.html

Washington DC - for more info visit http://dmv.dc.gov/service/vehicle-inspection?

West Virginia - for more info visit http://www.statepolice.wv.gov/trafficSafety/Pages/GeneralInspectionRequirements.aspx

Wisconsin - Some Counties Require Testing - for more info visit http://www.dot.wisconsin.gov/drivers/vehicles/im.htm

Wyoming - No Testing Required

Remember, it's important to get your car ready for inspection, but attempts to cheat the inspection process or trick machines into passing your car seldom work, and could land you in hot water.