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OAITW r.2.0

(25,692 posts)
1. Most likely and least costly way to start. Typically, them have coin type of batteries that should be easy to replace.
Tue Dec 5, 2023, 06:46 PM
Dec 2023

spooky3

(34,960 posts)
2. Sounds like the battery. They should be simple but Mazda's are ridiculously hard to replace.
Tue Dec 5, 2023, 06:51 PM
Dec 2023

If you have a Mazda and can’t or don’t want to go to a dealer, there is one good YouTube video that helps but you have to be very careful.

You may be able to take yours apart and use the physical key to open your doors before you can get the battery replaced.

OAITW r.2.0

(25,692 posts)
4. My 2007 VW came with a Fob as the ignition key.
Tue Dec 5, 2023, 07:01 PM
Dec 2023

The Fob has a hidden key that opens the door. In theory you can get in and drive away with a dead Fob.

OAITW r.2.0

(25,692 posts)
5. Iy you replace the battery, make sure it goes in with the "+" mark in same orientation as the one you take out.
Tue Dec 5, 2023, 07:07 PM
Dec 2023

Put in the wrong way and it won't work, positive side is usually on the top.

2naSalit

(89,039 posts)
7. All the above advice is good unless...
Tue Dec 5, 2023, 09:00 PM
Dec 2023

You have a car like my BMW. I asked the shop guys to replace the batteries and they handed them back to me and said they are designed to charge while the car is on. I have one key that locks and unlocks the doors and sometimes starts the car, the spare key never works with the door locks buy always starts the car.

When the one that sometimes starts the car actually does start the car, I feel obliged to take a little drive to charge it up. I worry about the day when I decide to drive it after leaving it sit for a couple weeks, that neither key would work.

KS Toronado

(18,238 posts)
9. All batteries can only be recharged so many times
Wed Dec 6, 2023, 12:22 PM
Dec 2023

Believe you was given some bad information, better ask around at battery or lock shops before
the keys give you trouble. Battery shop would probably be less expensive. Could do a google
search on your make/model/year and key battery. Let me know what you find out.

2naSalit

(89,039 posts)
10. To be honest...
Wed Dec 6, 2023, 02:08 PM
Dec 2023

I have been skeptical about that but never took the time to look it up. True, batteries burn out even if they are rechargeable.

I'll have to add that to the list that suddenly materialized in the last half hour!

k55f5r

(260 posts)
12. My 530i key battery went dead on me
Tue Jan 9, 2024, 01:55 PM
Jan 2024

BMW says that the battery in the key recharges when driving, but the battery wouldn't take a charge. I followed a youtube video on how to replace the battery - which is to cut the key at the seam with an exacto knife, replace the battery, and weld the key back together with a soldering iron. Worked great, took about 20 minutes and cost $8.99 for the battery.

2naSalit

(89,039 posts)
13. Thanks...
Tue Jan 9, 2024, 03:50 PM
Jan 2024

I'll keep that advice in mind I might be needing it before long. I know people who could do that for me too. Now that the roads are crappy, though, it will stay parked unless the roads are dry. The 4WD sensor won't turn it off once activated and I have to take it to the shop and after $80... And I HATE anti-lock brakes, my other vehicle is not ruined by having them, an older 4Runner.



And welcome to DU!

Best_man23

(4,953 posts)
8. Start by replacing the battery
Wed Dec 6, 2023, 08:59 AM
Dec 2023

As others have said, make sure you properly insert the new battery. If you still cannot unlock/lock the doors or open the trunk, you may need a new key fob.

If the battery replacement works, be sure to replace the batteries in any other key fobs for that vehicle.

If you have to replace the key fob, there are plenty of aftermarket key fobs, but I recommend going with an OEM. On most vehicles, programming is relatively easy (Google the year, make and model of the car and you might find the actual procedure). Make sure you do keep the old key fob; if it was originally programmed to the car when new, you may need this key fob to program others in the future (Ford key fobs work like this).

Kennah

(14,408 posts)
11. Some fobs you can disassemble and replace the battery. That will also show if there are any broken parts.
Fri Dec 8, 2023, 07:11 PM
Dec 2023
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