Cars made by Nissan, Chrysler and General Motors are all a part of this probe.
The National Highway Traffic Safety Administration is investigating reports of leaking brake fluid on 2007 and 2008 Nissan Altimas that could be impacting the effectiveness of the brakes. Regulators are also looking into reports that some air bags on some of Chrysler's Jeep Wranglers may not deploy in a crash. The third probe involves GM's 2007 Saturn Auras and a possible issue with the transmission.
Right now, investigators are just looking into owner's complaints. If any problem is found, it could lead to a recall.