Transmision sensor i have a mirage technica 1.8 1999 and the transmision dont want to change gears while driving which sensor could be damage ?

RepairLoader simple fast user and service manual download

But it is in English...search for 2002 Mirage service manual in your language, there might be one.

it is driven by a drive gear on the output shaft of the transmission. you could have a bad driven gear that is the gear that is driven to create the electrical pulses to show a speed. the drive gear on some transmissions are part of the output shaft and some gears are replaceable without replacing the output shaft. in either case a part can be replaced without replacing the complete transmission.

Sounds like a broken band in the trans.

Check the level and condition of the transmission fluid and if necessary the transmission fluid. Check the condition of the gears within the transmission (cracked, damaged) and change the gear cluster if necessary.

automatic.?
first learn now to tell, if the engine lacks power ,or the tranny is slipping
that is easy.
1: increase speed, does RPM(tachometer) rise faster (independant) of road speed. (that is called, trans slip.)
2: the trans dont slip. so the engine rpms stay low (gears work) and
the engine has no power.
if the engine has no power, fix engine.

The trans is very complex. if it messes up post that and what it does
under all driving and gear selecton modes, and hills and flat ground.
why pick the air flow meter, MAF , the most expensive part of EFI sensors. why guess there is a very simple test for the MAF, just ask.
its all in the FSM or here.
http://www.scantool.net/software/alldata-diy-1-month-subscription.html

take the lower trans pan off there it is dont think thats gonna fix it

try to change the fluid and the filter for transmisson. if that dont work then the trans will need rebuilt

If it only does this in third gear and no others then your tranny is faulty in that gear. Expensive fix.. I would make sure that your fluid is full and clean before I change the tranny.

quizas necesita revisar sensores de transmision,tambien el nivel de aceite,ya por ultimo quizas sea que ya empezo a resbalarse y va a necesitar una transmision nueva o usada.

Sounds more like a speed sensor located at the transmission. Have your car scanned for a Trouble code. They do it for free at most car parts stores (ie. AutoZone, Kragen's Checker..)