Oxygen (lambda) sensor, part number OZA591-VB2, removed from a KTM 990. OZA591-VB2 is an NTK/NGK catalogue number, so this is an aftermarket-branded sensor rather than a KTM-boxed OEM part.

It came off a KTM 990. Many LC8-platform KTM 950/990 models use a sensor of this type — check the part number against your bike before ordering. We do not publish a year-by-year fitment chart for this sensor.

The existing listing describes it as fully operational and supplied as a direct replacement. It is a used part sold as removed, and the photos show the actual item you receive.

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