Lexus > IS250 > 2006 2007 > 2.5L V6 > AWD. Lexus > IS250 > 2008 > 2.5L V6 > AWD; To 02/2008. Such vehicles should have a sticker under the hood or on the driver's door jamb that identify them. The front oxygen sensor is to detect the air-fuel ratio of the engine in different working conditions.
