problem with co-worker yaris, need opinion on what it could be.

[Adriaan]

Battery and alternator were checked, all good. But for the immobilizer if she gets one from a scrap yard, do the keys have to be reprogrammed? Also are the immobilizer year specific so and 08 for and 08 etc.?

[CTScott]

Originally Posted by Adriaan

Battery and alternator were checked, all good. But for the immobilizer if she gets one from a scrap yard, do the keys have to be reprogrammed? Also are the immobilizer year specific so and 08 for and 08 etc.?

Again - If it starts and dies it is not the immobilizer. The immobilizer is part of the ECM, so if she did decide to replace that she would need one of the original master keys from the car that the used ECM came from in order to program it with the keys for her car.

If you can confirm that it actually does start and die (as opposed to crank and not start), then I would look for vacuum leaks, bad MAF sensor, issue with plugs or coil packs, or a fuel system problem (bad fuel pump or plugged fuel filter).