My 1998 toyota avalon needs a new ignition switch with an immobilizer. Will i be able to buy one and replace it without reseting

the tumblers in the key switch maybe worn and require replacement. the key tumbler assembly will come with an new key.

Never try to reset the Immobilizer. It is advised to consult a programming personnel.

u can't what i did is i bring the lock cylinder to the lock smith, he change the inside so you can use the old key.
if you don't have the old key you to bring it to toyota so they can program the new key and it cost a lot

take it to a toyota dealer and have your "chip" key remade or reprogrammed.

Here's some instructions on how to do, Repair Guides Steering Ignition Lock switch AutoZone com

The motor can be replaced without touching the immobilizer system. There may be no problem with the immobilizer system as it only turns off power to the fuel pump or ignition spark.
better yet just re-seed the immobilizer ECM with the dealer

https://www.youtube.com/watch?v=w4oJhsUo9Wc
maybe this will help
http://www.partsgeek.com/mmparts/ignition_lock_cylinder/toyota/avalon.html

Yes, But if the key is used, the procedure is call reset the immobilizer ecu, not just program the key, this procedure is done

If you need further help, I’m available over the phone at https://www.6ya.com/expert/flavio_517b938f50183b92

The bulbs are replacable but yes the cluster does have to come out. Start with 2 screws and start dis assembling.

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