How do states use OBD II for emission inspections?

Many states connect a computer directly to a vehicle's OBD II system. The inspector can then read "faults." In some states, this type of inspection has replaced the tailpipe emission test.
See also:
How can my vehicle fail OBD II emission inspection?
Your vehicle can fail OBD II emission inspection
for any of the following reasons.
• If your Check Engine (MIL) light is lit, your
vehicle may fail inspection.
• If your vehicle's Check Engine l ...
Location
Location ...
Safety & Reliability
The C70 scores the highest rating, Good, in the Insurance Institute for
Highway Safety's frontal offset and side-impact crash tests, as well as for
rear-crash protection.
In addition to the requ ...
