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Discussion Starter #1
Morning,

I wonder if anyone can give me some advice?

We brought a second hand Santa Fe overa year ago. We had to replace the key fob batteries (both) within a couple of months and this has been a recurring problem ever since, they sometimes last 2 months at best. They just die on us with very little warning.

I have tried different makes of battery so assuming the fobs have been damaged somehow. We tried to take one apart and managed to break it so now only have the one working key.

Has anyone had a similar problem and is main dealer replacement my only option?
 

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There's no really cheap options but the dealer is likely going to hurt the most. Bit strange both doing the same thing unless they've bot been used and a lot. I wonder if a button is sticking and it's transmitting more than usual. Any issues when using it? When the batteries go flat, are they tested and confirmed as flat?
 

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maybe Autosparky is the guy been to know being a local. There's a number of things for a blank to work

  1. key needs to be cut but it is possible to move the blade across
  2. if the case can be opened and the transponder chip can be moved to the new case that will save that part of programming
  3. that leaves the transmitter for teh unlock to be programmed
  4. all programming is via the ODD2 diagnostic port
  5. some locksmiths could clone the old key
  6. I'd expect any auto locksmith or specialist would have the diagnostic to program
  7. obviously dealer
  8. To do security programming you need the PIN, that can be from Hyundai or decoded from the VIN
  9. I've used car keys online for the PIN codes
  10. transmitter needs matching to the BCM
Probably just confused you though with all that
 

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Discussion Starter #7
I've just ordered a cheapy Ebay replacement and am going to swap out the old parts into it and see if maybe the buttons are constantly touching in the old key or something. I haven't tested the batteries but they play about for maybe a day, as in take 2-3 attempts to open the car and then completely die. The car battery has flattened a couple of times too. My oh hoovered it out the other day and left the doors open and flattened the battery. We had to jump start it. I wonder if its all connected?
 

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I'd be keen to test the batteries when they seem flat. One of our i430 remotes is a bit dud, needs a few love taps to get it working but you could mistake it as a bad battery too.
 

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Discussion Starter #10
I'm going to use the broken second key as we have all the inside gubbins. We just broke the key mechanism 🙈.
 
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