Safety investigators are looking into possible transmission problems in some 2011 and 2012 Ford Mustang models and fuel lines in 2011 Volkswagen Jettas.
The National Highway Traffic Safety Administration's Office of Defects says on its website Sunday that it has received 32 complaints about an unexpected inability to shift into gear on Mustangs with manual transmissions.
Some reports allege the problem occurred while merging into high-speed traffic. The preliminary investigation involves 26,000 vehicles.
Seven complaints alleging leakages from the fuel line to a fuel injector in some Jetta models also have been received. That probe involves about 40,000 vehicles.
Spokesman Wes Sherwood says Ford Motor Co. is "going to fully cooperate" with the government's review.
The Associated Press left messages Sunday seeking comment from Volkswagen officials.