Lost my only key but have a working transponder key and amplifier set from my 98 Avalon parts car. Can i just swap them both instead of getting a new transponder key programmed from the dealer?

You would have to get a new set of keys from Toyota car dealer ship stores and a locksmith.

The new key must be programmed using special procedures you can't do at home, you must alos have at least one working transponder key or the module must be replaced, about a $600 part.

u cant unless ur good at computers and wirin--get the key code from the VIN # and make one at a locksmith

common problem the lock wears out and wont turn a replacement lock at auto parts store is about 100.00 dollars problem is if you have a transponder key the new lock comes with a plain key so when you change it the car wont start the way around this is what i did 2 months ago to my own car 1998 camry ( same car ) you need to take the bottom cover of the dash under the steering column off there is a little hole in the steering column under the key lock its a button up there your supposed to push when the key is in the on position but the problem is it wont turn so you have to drill it out its a hardned pin to prevent theft use a cobalt drill bit i think its 3/16 or close to it before you do this disconnect battery remove the little box from key lock under dash it has small phillips screws and the electrical ignition switch from the back of the ignition lock than drill till you can pop out the ignition lock you have to pop off the cover around the lock it has the green coil light in it when you turn on the key it lights thats the transponder coil for the computer now turn the key in the new lock on and slide it in reassemble everything connect battery turn key make sure it cranks but it you have anti theft key it wont start cut your old key apart carefully and take out the transponder chip cut a hole in the new key to glue in the chip and car will start now if you have transponder key you are looking at about 600.00 from dealer if you have a standard key its about 400.00 hope this helps

I HAD TO REPLACE THE COLUMNON A 2001 AVALON BECAUSE THE KEY LOCKED UP NOW IT WONT START BECAUSE IT SAYS IM USING THE WRONG TRANSPONDER KEY HOW DO I REPROGRAM THE SECURITY ANTI THEFT TO ALLOW ME TO START THIS CUSTOMER CAR

This means that the programming of the Transponder Key has been corrupted or the Programming data of the Key in ECU ( Electric Control Unit ) has been lost or not responding. You now have to get a new Transponder Key. You can get it on E-bay for $30. After you receive it, reprogram the car to the New Transponder Key to the ECU ( the process in usually given in the instruction manual or in the Service Manual ). Then the car will start perfectly.

The first thing to do is try another key. Perhaps your transponder key has failed.
You can identify a 'transponder key'; it has a wide part wher you turn it.

call the dealership with our serial number they will cut you a key that goes there just show proft ownership thanks .pierre

i would have a dealer look at it those alarms are very complicated..

key is worn down go to a locksmith and have a key cut by code