Last August, when the National Highway Traffic Safety Administration (NHTSA) opened up an investigation into failing ignition coils in some Volkswagen vehicles, the automobile maker offered an emission service program to inspect and replace ignition coils installed in some 2001-2007 vehicles. The NHTSA has intensified their investigation because of possible fire problems that could affect almost half a million Volkswagen Passats with four cylinder turbo engines. Additional consumer complaints and records from Volkswagen show that the problem could involve a greater number of vehicles and may lead to a recall.

The NHTSA reported that they have received 14 complaints of fires and another 21 complaints of ignition coil failures that caused vehicles to suddenly lose power. Volkswagen reported another 199 complaints, although it is not clear how many of those involved fires.