Cars and Light Trucks
Inspection & Maintenance (I/M)
Search for Documents
Search the Document Index System (DIS) database to find:
- Advisory Circulars
- Applications for Certification
- Certificates of Conformity
- Certificate Summary Information Reports
- Manufacturer Guidance Letters
- Verify System Documentation
Best Practices
Vehicle inspection and maintenance programs (I/M) help improve air quality by identifying high-emitting vehicles in need of repair (through visual inspection, emissions testing, and/or the downloading of fault codes from a vehicle's onboard computer) and causing them to be fixed as a prerequisite to vehicle registration within a given non-attainment area. The 1990 Amendments to the Clean Air Act made I/M mandatory for several areas across the country, based upon various criteria, such as air quality classification, population, and/or geographic location.
| Regulations | Policy Guidance |
| On-board Diagnostics | Technical Guidance & Test Procedures |
| Tampering and Warranty | State Status |
| Remote Sensing | Program Evaluations |
| Archive: Older Files & Publications |
Contact: Dave Sosnowski at 734-214-4823 or sosnowski.dave@epa.gov