Fob Immobilizer Question
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Pit Crew
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Fob Immobilizer Question
I got a replacement 2nd fob for my CPO nx200t. I am told that the missing one that's out there is still "married" to the car and can open and start it, even after they reprogram the new key. They said I needed two NEW fobs to kick that missing one off the system. Isn't that the whole point with reprogramming immobilizers? They are trying to tell me the original fobs were identical so the missing spare can't be kicked off the system. Any help would be appreciated.
Thanks,
Joe
Thanks,
Joe
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Joined: Apr 2015
Posts: 585
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From: NJ
They are twins but not identical. Each fob carries with it all the presets, seats mirrors etc. It sounds like they programmed the new fob to its new twin or the car. Not sure which they program.
Unless your old fob has some ID on it that would tell someone where they might find your car the chances are slim that the person who MIGHT have found it would know which Lexus it belonged to. They would have to drive around pushing the key fob at every Lexus they came by.
Unless your old fob has some ID on it that would tell someone where they might find your car the chances are slim that the person who MIGHT have found it would know which Lexus it belonged to. They would have to drive around pushing the key fob at every Lexus they came by.
Thread Starter
Pit Crew
Joined: Jul 2001
Posts: 237
Likes: 51
They are twins but not identical. Each fob carries with it all the presets, seats mirrors etc. It sounds like they programmed the new fob to its new twin or the car. Not sure which they program.
Unless your old fob has some ID on it that would tell someone where they might find your car the chances are slim that the person who MIGHT have found it would know which Lexus it belonged to. They would have to drive around pushing the key fob at every Lexus they came by.
Unless your old fob has some ID on it that would tell someone where they might find your car the chances are slim that the person who MIGHT have found it would know which Lexus it belonged to. They would have to drive around pushing the key fob at every Lexus they came by.
Instructor
Joined: Jul 2010
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From: SC
There's programming a new key and then there's resetting the whole system. It's called reseeding. In order to kick the old one off, you'll have to reseed the computer. The problem with used keys is they may or may not always be able to be reprogrammed. Even if they are able to technically be reprogrammed, there's still no guarantee the used key will work. Some Lexus models don't allow the reprogramming of the key, some do. I'm not sure which models though. Hence why they might be saying you need 2 new keys. Lets say you only program one, then you lose that, then you're right back where you were.
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Pit Crew
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There's programming a new key and then there's resetting the whole system. It's called reseeding. In order to kick the old one off, you'll have to reseed the computer. The problem with used keys is they may or may not always be able to be reprogrammed. Even if they are able to technically be reprogrammed, there's still no guarantee the used key will work. Some Lexus models don't allow the reprogramming of the key, some do. I'm not sure which models though. Hence why they might be saying you need 2 new keys. Lets say you only program one, then you lose that, then you're right back where you were.
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Pit Crew
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Not costing me anything under warranty - them, it's their job. I reached this same conclusion but to be sure I called Lexus corporate who reassured me the missing key is now useless. Not wasting any more thought on this, just annoyed at the illogical thinking on service policy if that was indeed the case.
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