Licensed Diesel Emissions Testing Stations                                                                                                     
                 Light Duty Stations                                                                           ** = Closed Temporarily                                                                          
                                                                                                     MHC Kenworth                                                                                  
                 Andersen’s Foreign Car Service                                                      7007 Sandown Rd.                                                                             Houska Automotive Services  
                 16289 W. Colfax Ave.                                                                Denver, CO. 80216                                                                            899 Riverside Ave. 
                 Golden, CO. 80401                                                                   (720)941-0833                                                                                Fort Collins, CO. 80524            
                 (303)278-8766                                                                                                                                                                    (970)482-0156 
                                                                                                                                                                                                  AWD testing available 
                 Diesel Repair & Performance                                                         Light and Heavy Duty Stations                                                                 
                 6250 E Pine Lane Unit B                                                                                                                                                          L&N Diesel Emission Testing and Repair  
                 Parker, CO. 80138                                                                                                                                                                1700 W. Mississippi Ave. 
                 (303)841-6527                                                                       Akisp Diesel Emissions                                                                       Denver, CO. 80223 
                                                                                                     6232 Beach St. Unit B3                                                                       (303)937-8485 
                 Exhaust Readers II                                                                  Denver, CO. 80221                                                                            AWD testing available 
                 5150 Edison Ave.                                                                    (720)434-9343                                                                                 
                 Colorado Springs, CO. 80915                                                                                                                                                      Lake Arbor Automotive and Truck  
                 (719)574-7063                                                                       Al’s Front Range Diesel                                                                      9146 Marshall Pl. 
                 AWD testing available                                                               1115 Bowen Cir.                                                                              Westminster,  CO. 80031 
                                                                                                     Longmont, CO. 80501                                                                          (303)429-7700 
                 5th  Gear Automotive, Inc.                                                          (303)776-6469                                                                                 
                 7301 W. 118th Pl.                                                                                                                                                                Mountain Air Emissions  
                 Broomfield, CO. 80020                                                               Branch Automotive and Diesel Emissions, LLC.                                                 19356 Goddard Ranch Ct. 
                  (303)466-6552                                                                      6030 E. County Line Rd.                                                                      Morrison, CO. 80465 
                                                                                                     Highlands Ranch. CO. 80126                                                                   (303)697-6850 
                 Front Range Fleet and Auto, Inc.                                                    (303)771-2224                                                                                AWD testing available 
                 8500 E. Warren Ave.                                                                 AWD testing available                                                                         
                 Denver, CO. 80231                                                                                                                                                                Nelsen’s Auto Tech Center  
                 (303)907-0555 or (720)219-6717                                                      Central Denver Diesel Emission                                                               361 1/2 E. Mountain Ave. 
                                                                                                     1400 W. Alameda Ave.                                                                         Fort Collins, CO. 80524                
                 Greeley Automotive Machine                                                          Denver, CO. 80223                                                                            (970)484-0834 
                 404 8th Ave.                                                                        (303)618-6435                                                                                AWD testing available 
                 Greeley, CO. 80631                                                                                                                                                                
                 (970)352-4342                                                                       Chase Automotive Repair and Service                                                          Proformance Diesel & Auto Repair 
                                                                                                     15601 E. 6th Ave. Ste.60                                                                     1125 S. Garfield Ave. 
                 H&M Transmission and Automotive                                                     Aurora, CO. 80011                                                                            Loveland, CO. 80537 
                 500 2nd St.                                                                         (303)344-4670                                                                                (970)667-7396 
                 Castle Rock, CO. 80104                                                                                                                                                            
                 (303)663-5578                                                                       Dynoman Diesel Emissions                                                                     Redburn Tire Company  
                                                                                                     10420 E. 106th Ave.                                                                          1641 2nd Ave. 
                 J&J Truck and Auto                                                                  Brighton, CO. 80601                                                                          Greeley, CO. 80631                     
                 15551 E. 6th Ave. Unit 70                                                           (303)288-4344                                                                                (970)454-4000 
                 Aurora, CO. 80011                                                                                                                                                                                           
                 (303)364-4244                                                                       Engle Automotive                                                                             Rocky Mountain Diesel Emissions  
                 AWD testing available                                                               808 N. Denver Ave.                                                                           9999 Brighton Rd. 
                                                                                                     Loveland, CO. 80537                                                                          Henderson, CO. 80640 
                 Lee Myles Boulder                                                                   (970)635-9760                                                                                (303)288-5500 
                 6270 Arapahoe Rd                                                                                                                                                                  
                 Boulder, CO 80303                                                                   Excel Diesel                                                                                 Rocky Mountain Diesel Services, Inc.  
                 (720)726-7760                                                                       7591 Shaffer Pkwy. Unit A                                                                    150 E. 18th St. 
                                                                                                     Littleton, CO. 80127                                                                         Greeley, CO. 80631                       
                 Lundstedt Automotive, Inc.                                                          (303)904-1500                                                                                (970)356-2672 
                 1401 E. Lincoln Ave.                                                                                                                                                              
                 Fort Collins, CO. 80524                                                             Excel Diesel and SUV                                                                         Springs Auto Truck and RV Service Center 
                 (970)221-9400                                                                       736 Castleton Rd Unit C                                                                      6035 Galley Rd. 
                                                                                                     Castle Rock CO 80109                                                                         Colorado Springs, CO. 80915 
                 Performance Wise, Inc.                                                              (720) 524-6221                                                                               (719)382-0363 
                 4395 Xenon St.                                                                                                                                                                    
                 Wheatridge, CO. 80033                                                               Excel Diesel and SUV                                                                         Stewart & Stevenson 
                 (720)898-0808                                                                       49 N. 42nd Ave.                                                                              5840 Dahlia St. 
                                                                                                     Brighton, CO. 80601                                                                          Commerce City, CO. 80022 
                 **True Speed**                                                                      (303)659-0442                                                                                (303)287-7441 
                 11450 Huron St #R                                                                                                                                                                 
                 Northglenn, CO 80234                                                                Excel Diesel and SUV, LLC.                                                                   TransWest Truck Trailer R.V. 
                 (303) 489-3431                                                                      9078 S. Woodman Way Ste. D                                                                   20770 E. I-76 Frontage Rd. 
                                                                                                     Parker, CO. 80134                                                                            Brighton, CO. 80603 
                 Heavy Duty Stations                                                                 (303)400-6040                                                                                (303)289-3161 
                                                                                                                                                                                                   
                 JECO Inc.                                                                           Exhaust Readers                                                                              Windways Xpress 
                 1247 E. 68th Ave.                                                                   4202 N. Nevada Ave.                                                                          4940 Oneida St 
                 Denver, CO. 80229                                                                   Colorado Springs, CO. 80907                                                                  Commerce City, CO. 80022 
                 (303)623-7049                                                                       (719)260-6629                                                                                (303) 385-1711 
                                                                                                                                                                                                   
                                                                                                                                                                                                   
                                                                                                      
                                                                                                      
                                                                                                                         
                                                                                                                         
                                                                            (303)205-5603                                                 (303)744-2522                                                             Updated on  05/04/2021