If enough consumers complain about the same problem with the same type of vehicle, the National Highway Traffic Safety Administration (NHTSA) may open an investigation. The Office of Defects Investigation (ODI) is the agency in charge of performing those investigations.
The 2003 Ion has been investigated 5 times, which is more than any of the other 4 years. On average you can expect 3.0 investigations per model year and we've listed some of the most recent below.
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