Mar 15, 2020
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I recently got a seat Leon FR 2016 it never had the tech pack on it (kind of wish I got one with the tech pack now) I am looking at changing the headlight to the led triangle ones does anyone know if they are easy to change or does any know if I can get the tech pack added to my car from seat?
 
Others have more expertise on this kind of thing than me but I suspect this is one of those items that's theoretically possible but very expensive in practice.

I don't think a halogen to LED conversion is plug and play. You'll need wiring and coding changes too.

Bottom line is, it would be cheaper to sell your car and buy one with a technology pack.
 
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As said it is possible, but requires changing the wiring and modules, plus coding.
A suggestion instead of changing the whole system could be to get some aftermarket halogen bulbs such as Phillips Racing vision.

If you are really interested in doing it, there is a retrofit guide here from the Spanish forums, I suggest giving it a good read and checking out the cost for all the bits before making a decision:
https://www.clubseatleon.net/viewtopic.php?f=40&t=117989&sid=ec00831de27b812efa65c813a85dac66
 
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With the pre-face lift LEDs then you are no worse off with halogens, they aren't that brilliant (pun intended).

Otherwise it would be cheaper and less complex to change the car than change the headlights, just whatever you do don't go for retro fit led or HID lamps - they are a crime against humanity.