Hyundai Trajet car-keys - finding replacements

I recently lost the spare keys for my Hyundai Trajet, and found it was difficult to replace them. This page includes some useful information if you have the same problem. The information also applies to Hyundai cars such as the Santa Fe and others.

The first thing is that it's worth looking quite hard for the keys. It will cost you up to £100 for the replacement, or more if you have lost both sets. When you bought the car you should have received two sets of keys, both marked "M", and a little tag with a number on it. Don't worry too much if you have lost the tag, the dealer should have kept a note of it and will be able to find it on his database. However, if you are using an auto locksmith to prepare your key it might be useful to have the tag.

If you have a look on ebay or other auction sites you'll probably be able to find blank Hyundai keys. Your local locksmith probably also stocks them. However, these blank keys are not really much use, since they don't include a transponder, which is a little electronic chip which transmits a signal to the car when you turn on the ignition. Without this signal, the car won't start.

What you need is a key cut for your car, which includes a transponder chip. You then need to have your car ECU programmed to recognise the new key, which can be done by your dealer or an auto locksmith. If you had an old key for another Hyundai you could probably use the transponder out of that, but it would be a bit fiddly to organise, so basically you are best going to a dealer. (NOTE: recently Timpsons, the high street dry cleaning/key cutting/engraving franchise, have started to cut chipped keys, so it's probably worth trying them as well.) I tried a few auto locksmiths as well, but up here in Scotland there wasn't anyone that could do it cheaper than the dealer. If you have lost both sets of keys, you'll need to get a mobile locksmith who can come out to your car but it costs a bit more.

It will probably take the dealer a few days to order the key in, and then you'll need to take your car in to get it programmed into the system.It cost me about £80 for this, (£45 for the key and £35 to get the car programmed.) A keyless remote would have cost about another £50, but I passed on that.

Keyless Remote

Once we tried the key out though, it became obvious that another keyless remote was fairly much essential, since if you lock the car with the remote it arms the alarm system, so if you unlock it with the new key the alarm goes off and the immobiliser stops the engine from starting. Luckily I was able to pick up a second-hand one on ebay for a few pounds, and was able to get it working fairly easily. The one I bought was advertised as compatible with Accent, Coupe, Lantra, Pony, Matrix etc. but it worked fine on a Trajet as well. The Hyundai Service Manual includes details of how to do it which I won't repeat here, but you can find fairly easily by searching on the internet. The manual says you need to remove the lower crash-panel, but in fact it's not really necessary if you are flexible enough, the "SET" switch is on the bottom of the unit just above the driver's footwell. Remember to set both remotes at the same time, otherwise your old one will now stop working.