DETROIT -- U.S. safety regulators are investigating problems with air bag sensors in the seats of some small Suzuki SUVs.

The probe covers 205,000 vehicles including Grand Vitaras from the 2006 through 2011 model years and SX4s from 2007 through 2011.

The National Highway Traffic Safety Administration says 128 owners have complained about problems with sensors in the front passenger seats that turn off the air bag when a child is sitting there.

In some cases, the sensors won't detect a child and air bags will inflate. If that happens, a child could be hurt. In other cases, warning lights go off because of software problems.

Investigators will check to see if the problems are bad enough to cause a recall.

The safety agency hasn't received any complaints of crashes or injuries.