The Motor Vehicle Inspection Agency says over 77,000 vehicles failed inspection in 2012, because of warning lights that were either flashing or not working at all. That was the first year the agency began checking whether cars' warning lights were lit.
"Many more cars failed in this area than we ever could have thought," says Morgan Isacsson, a technical consultant at the agency.
He says the agency is concerned because in many cases, the car has serious problems. For example, in over 50,000 cars the warning light flashed for air bag problems and 24,000 vehicles had brake problems.
The agency says some people shut off the warning light completely to conceal the fact that something was wrong with the car.