Diesel Vehicles

Diesel Emissions Program
The full counties of Boulder, Jefferson, Broomfield, Denver, and Douglas, and portions of Adams, Arapahoe, Larimer, Weld, and El Paso counties require a passing emission test to register a vehicle. See our map for testing locations and diesel emissions area boundaries. If you are unsure if a diesel test is required in your area, please contact your local county motor vehicle office.

The 2018 emissions requirements for a diesel vehicle

**2018 Diesel Emissions Requirements**
Model Year	Diesel Testing	Frequency of Test	Testing Fee
2018	Exempt	n/a	n/a
2017	Exempt	n/a	n/a
2016	Exempt	n/a	n/a
2015	Renewals are Exempt	n/a	n/a
2015	Need test if transfer of ownership	Every two years	Rates vary per diesel center
2009*- 2014	Need test	Every two years	Rates vary per diesel center
1987 - 2008	Need test	Annually	Rates vary per diesel center
1976 -1986 with Collector Plates	Need test	Every five years	Rates vary per diesel center
1976 -1986 without Collector Plates	Need test	Annually	Rates vary per diesel center
1976 or newer Grandfathered**	Exempt	n/a	n/a
1975 and older with Collector Plates	Exempt	n/a	n/a
1975 and older without Collector Plates	Need test	Annually	Rates vary per diesel center

*Transition from biennial to annual testing is based on the MSO (Manufacturer Statement of Origin) date of the vehicle. See local County DMV for more information.

**Vehicles model year 1976 or newer that have been registered as a "collector's item" prior to September 1, 2009, and the registration has never lapsed or expired.

New diesel vehicles with a GVWR of 26,000 lbs. or less are exempt for the first four model years.

New diesel vehicles with a GVWR of 26,001 lbs. or more are exempt for the first six model years.

Can I register my diesel vehicle online?

Yes. Effective June 1, 2017 all diesel vehicles that do require a passing emission test (Boulder, Jefferson, Broomfield, Denver and Douglas Counties, and portions of Adams, Arapahoe, Larimer, Weld and El Paso counties) are eligible for online renewal.

Locations

Diesel emission testing facilities charge up to one-hour of the posted labor rates, so fees will vary. Contact the specific station for fees.

View a map of testing locations and diesel area boundary

Light Duty Stations

Alliance Auto Care (AWD)

827 S. Lincoln Ave.

Loveland, CO. 80537

(970)660-4429

Andersen's Foreign Car Service

16289 W. Colfax Ave.

Golden, CO 80401

303-278-8766 by appointment only

CarTech, Inc.

1730 W. Mississippi Ave.

Denver, CO 80223

303-922-9393

Diesel Repair &Performance (Out of Service)

6250 E. Pine Ln. Unit A & B

Parker, CO 80138

303-841-6527

Exhaust Readers II (AWD)

5150 Edison Ave.

Colorado Springs, CO. 80915

719-574-7063

Fifth Gear Automotive, Inc. (Out of Service)

7301 W. 118th Pl.

Broomfield, CO 80020

303-466-6552 by appointment only

Front Range Fleet and Auto, Inc.

8500 E. Warren Ave.

Denver, CO 80231

303-907-0555 or 720-219-6717 by appointment only

Greeley Automotive Machine (AWD)

404 8th Ave.

Greeley, CO 80631

970-352-4342 appointments preferred

H&M Transmission and Automotive

500 2nd St.

Castle Rock, CO 80104

303-663-5578 by appointment only

J&J Truck and Auto (AWD)

15551 E 6th Ave. Unit 70

Aurora, CO 80011

303-364-4244

Lundstedt Automotive, Inc.

1401 E. Lincoln Ave.

Ft. Collins, CO 80524

970-221-9400

Performance Tune

1007 Centre Ave.

Ft. Collins, CO 80526

970-482-3971 by appointment only

Performance Wise, Inc.

4395 Xenon St.

Wheat Ridge, CO 80033

720-898-0808

Heavy Duty Stations

MHC Kenworth

7007 Sandown Rd.

Denver, CO 80216

720-941-0833

Also test medium-duty trucks

JECO Inc.

1247 E 68th Ave.

Denver, CO 80229

303-623-7049

Also test medium-duty trucks

No appointment needed

Open 24 hours (Mon-Fri) 8-5pm (Sat-Sun)

Light & Heavy Duty Stations

Agfinity, Inc. (OUT OF SERVICE)

1641 2nd Ave.

Greeley, CO 80631

970-454-4000

Akisp Diesel Emissions

6232 Beach St. Unit B3

Denver, CO 80221

720-434-9343

Al’s Front Range Diesel

1115 Bowen Cir.

Longmont, CO 80501

303-776-6469 by appointment only, not able to test VW’s

Branch Automotive and Diesel Emissions, LLC. (AWD)

6030 E County Line Rd.

Highlands Ranch, CO 80126

303-771-2224 appointment preferred

Chase Automotive Repair and Service

15601 E 6th Ave. Suite 60

Aurora, CO 80011

303-344-4670

Douglas County Diesel, LLC.

1160 Caprice Dr.

Castle Rock, CO 80109

303-660-9986

Dynoman Diesel Emissions

10420 E. 106th Ave.

Brighton, CO 80601

303-288-4344 by appointment only

Engle Automotive

808 N. Denver Ave.

Loveland, CO 80537

970-635-9760 appointment preferred

Excel Diesel

7591 Shaffer Pkwy. Unit A

Littleton, CO 80127

303-904-1500 by appointment only

Excel Diesel and SUV

49 N. 42nd Avenue

Brighton, CO. 80601

303-659-0442

Excel Diesel & SUV, LLC

9078 S. Woodman Wy. Suite D

Parker, CO 80134

303-400-6040

Exhaust Readers

4202 N. Nevada Ave.

Colorado Springs, CO 80907

719-260-6629 by appointment only

Houska Automotive Services (AWD)

899 Riverside Ave.

Ft. Collins, CO 80524

970-482-0156 by appointment only

L & N Diesel Emission Testing and Repair (AWD)

1700 W. Mississippi Ave.

Denver, CO 80223

303-937-8485 by appointment only

Lake Arbor Automotive and Truck

9146 Marshall Pl.

Westminster, CO 80031

303-429-7700

Mountain Air Emissions (AWD)

19356 Goddard Ranch Ct.

Morrison, CO 80465

303-697-6850 appointment preferred

Nelsen’s Auto Tech Center (AWD)

361½ E. Mountain Ave.

Ft. Collins, CO 80524

970-484-0834 appointment preferred

Proformance Diesel & Auto Repair

1125 S. Garfield Ave.

Loveland, CO 80537

970-667-7396 appointment preferred

Progressive Diesel, Inc.

2061 W. Hamilton Pl.

Englewood, CO 80110

303-761-4232 (Closed on Fridays)

by appt. only

Rocky Mountain Diesel Emissions

9999 Brighton Rd.

Henderson, CO 80640

303-288-5500 trucks only

Rocky Mountain Diesel Services, Inc.

150 E. 18th St.

Greeley, CO 80631

970-356-2672

S & S Services Inc., Diesel Emissions Testing

11705 Teller St. Unit F

Broomfield, CO 80020

303-460-7786 appointment preferred

*If paying by credit card, an additional fee of $5.00 will be applied*

Schwinzell’s Diesel, Inc.

614 Sherry Dr.

Ft. Collins, CO 80524

970-493-3123 (by appt. only)

Springs Auto Truck and RV Service Center

6035 Galley Rd.

Colorado Springs, CO. 80915

719-382-0363 by appointment only

Stewart & Stevenson (Out of Service)

5840 Dahlia St.

Commerce City, CO 80022

303-287-7441 Trucks only, by appointment only

TransWest Truck Trailer RV

20770 E 1-76 Frontage Rd.

Brighton, CO 80603

303-289-3161