Toyota Motor Sales said on Wednesday that it will re-notify owners of certain older vehicles involved in a safety recall first announced last April for the front passenger airbag inflators installed in several models. The automaker said it is modifying the remedy procedure.

OEM officials explained the 2013 recall remedy involved inspection of the front passenger air bag, and if equipped with an affected inflator, the inflator would be replaced with a newly manufactured one at no charge to the owner.

“Toyota has determined that the involved serial numbers provided by the supplier were incomplete, and did not include all of the potentially involved inflators,” the automaker said.

 For vehicles which were inspected and did not receive a replacement inflator, Toyota will re-notify the owners and replace the inflator with a new one.

 For vehicles which have not received the 2013 recall remedy previously, Toyota is changing the remedy from “inspect and replace the inflator if it is involved” to “replace the inflator with a new one.”

 “The involved vehicles were equipped with front passenger airbag inflators which could have been assembled with improperly manufactured propellant. Improperly manufactured propellant could cause the inflator to rupture and the front passenger airbag to deploy abnormally in the event of a crash,” officials said.

Toyota said approximately 766,300 vehicles in the U.S. were covered by the 2013 recall, including vehicles that were previously inspected and already received a replacement inflator.  This recall involves:

— 2003-2004 Toyota Corolla, Corolla Matrix and Tundra
— 2002-2004 Sequoia
— 2002-2004 Lexus SC 430 coupes

The automaker said owners of vehicles subject to this safety recall will receive an owner notification letter by first class mail. 

Detailed information is available to customers at www.toyota.com/recall, the Toyota Customer Experience at (800) 331-4331, www.lexus.com/recall and Lexus Customer Satisfaction at (800) 255-3987.