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Rx400H 2005 Key Programming

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Hi there everyone, I'd be grateful for your help with my problem.

I have a '55' rx400h but only one key.

I've bought a replacement keyfob from eBay and had the blade cut by laser.

I now need to programme this used transponder so it works with my car.

Does anyone know if this is possible as a DIY without going to the dealers?

Thanks for your help.

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