Spare Key Self-Programming - How To Guide - Page 39 - Mazda3 Forums : The #1 Mazda 3 Forum
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post #381 of 390 (permalink) Old 06-03-2017, 11:28 PM
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can I program transponder for 2012 Mazda 3 myself?

I'm confused.

I have a new to me 2012 Mazda 3 iGT hatch. Two working fobs with embedded keys.

Can I buy a transponder key, and program it myself? That way I'd have a 3rd spare.

But if I have to bring it to the dealer to program, there'd be no point in getting it.

Also where is a good inexpensive place to get a transponder? Looks like there's plenty on ebay.

Third question - my fobs with new batteries don't read until maybe 8 feet from the car. That seems short. Is it? It possible to improve (new fobs, or replace the control unit myself)?

Thank you!!
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post #382 of 390 (permalink) Old 06-04-2017, 04:14 PM
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Get basic transponder key from eBay. I paid $10 for the black basic key an $25 for a 3rd flip key w/remote. Use the guide on self programing since you have 2 original keys that are required to self program.

As far as distance for the flip key fob my 2011 can work lock/unlock from a line of sight 30 ft. Try cleaning the internal contacts with the battery removed with 90 proof rubbing alcohol.
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post #383 of 390 (permalink) Old 10-04-2017, 08:50 PM Thread Starter
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Quote:
Originally Posted by iXod View Post
Am I the only one for whom this key programming thing doesn't work?

I have 2 working keys for my 2004 Mazda 3: an original Mazda one and a generic one; both start the car.
...
I'm stumped. Any idea why this isn't working for me?

Thanks.
Your second working key, the "generic" one, how was it programmed?

Some locksmiths will simply clone a working key, this does get the cloned key to start the car but it won't work for this process because the car seed both keys as the same (the car thinks you're inserting the same key twice).


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post #384 of 390 (permalink) Old 03-25-2019, 07:42 PM
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Just bought a used 2012 Mazda 3i that came with only one key.

If I want to add an aftermarket (Compustar) alarm with remote start, I assume that the remote start module will need one additional programmed key? Is this correct?
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post #385 of 390 (permalink) Old 03-26-2019, 01:17 PM
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Yes. You'll need to go to a bonded locksmith or the dealership for a second key. Whatever you do, DO NOT LET THEM CLONE YOUR CURRENT KEY!!!! It needs to be a NEW key!

It is what it is.
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post #386 of 390 (permalink) Old 03-26-2019, 03:29 PM
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Yes. You'll need to go to a bonded locksmith or the dealership for a second key. Whatever you do, DO NOT LET THEM CLONE YOUR CURRENT KEY!!!! It needs to be a NEW key!

It is what it is.
Follow-up questions: what's a bonded locksmith? How can I know if they clone my key rather than making a new one?
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post #387 of 390 (permalink) Old 03-27-2019, 08:06 AM
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Any legit locksmith is licensed and bonded. They'll have their license number on any paperwork or receipt that they give you.

To make sure they don't clone your key, don't give them your key! Have them make a brand new one, as if none exists at all. They can do this by the VIN.

The reason a cloned key doesn't work for what you need is, the PCM sees a clone key and the original key as exactly the same key. So, as far as the PCM is concerned, you still only have one key. Therefore, you can't make a third key by yourself, and you also can't program a remote start.
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post #388 of 390 (permalink) Old 03-27-2019, 03:45 PM
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One last question: after they make a new key, will I need my old key to be reprogrammed? Just wondering if the creation of a new key wipes out previously programmed keys.
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post #389 of 390 (permalink) Old 03-28-2019, 01:53 PM
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No, it doesn't wipe out the old key.

What you may want to do is, buy two keys from the locksmith, let them cut both of them for you, but DO NOT let them program the third key. Program that one yourself by doing the hokey pokey with the lock and doors. There's instructions on here on the process.

For the hokey pokey to work, you have to have two different keys. Your original, and the one the locksmith programmed with their computer.

Now, do the hokey pokey with the locksmith key and your key. Then program the third yourself, right there in the parking lot of the locksmith. If the key won't program, and you get a red flashing light on your dash instead of the key actually working, they did something wrong, and you'll never get the remote start to work. Have them fix the glitch.
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post #390 of 390 (permalink) Old 04-01-2019, 01:05 AM
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Originally Posted by theblooms View Post
If the key won't program, and you get a red flashing light on your dash instead of the key actually working, they did something wrong, and you'll never get the remote start to work. Have them fix the glitch.
Dumb question incoming: if I get one locksmith to cut the key for me and I get another locksmith to program the cut key (without giving him my original), then I'll know he did it correctly if the second key is able to start the car right?
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