Transmission Fluid Temperature Sensor?

[bixaz]

Hi all,

have a small problem. A couple of days ago CheckEngine light up so I went to diagnotics and they said it was "Transmission fluid temperature sensor malfunction". Searched the forum and the web and http://www.lexuspartsnow.com/ , but couldnt find anything similar to that sensor... At the workshop they deleted the error and today CheckEngine is back on again, so I thought to look for that "sensor" with no luck. Any ideas?

The car: SC300, 99' 4 gear auto. transmission

Thanks in advance