Far from it, Immo work is probably one of my weakest areas and one of my recent steep learning curves (with still a long way to go) There are far more knowledgeable people than me on this site.
My questions arise because as far as I am aware second hand transponder chips can not be used on Astra G's , it will depend on whether the vehicle is running a Immo 2 or Immo 3 system, but either way new chips are under £10 so I don't see the need to use a second hand one? (more knowledgeable people please correct me)
If I read your post correctly, the vehicle had one key that you have cloned with a second hand chip that you have brought and fitted it into a second key blade, is this correct?
If so you know which key has failed yet?
If its the one you cloned then I would be tempted to buy a new chip and just program it in (it takes under 2 mins)
As to your question regarding their reliability, anything can and does fail in service, but I do not find myself replacing them often.
Again perhaps a locksmith on here can enlighten us.
Mark
Modern cars, Its all wizardry and witchcraft
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