2008 E() Fob new battery

navydoug33309 · 10-09-2022, 07:55 AM

I recenetly installed two new 2022 batteries in my fobs......they dont work, i read you need to "reprogram" after replacing the batteries. HAs anyone else sucessfully completed new batteries installed in your FOBS ? thnx

e90yyc · 10-09-2022, 10:03 AM

You don't mention whether it's a CA or non-CA key.

Regardless, reprogramming should not be required for a simple battery replacement.

If you have CA keys, try putting one in the slot and starting the car that way. Then see if it works. If it won't work, put it in the slot and hold down the START/STOP button and see if it eventually turns over.

Then once you've successfully started the car, try the key out again for regular lock/unlock functions.

(I could be wrong about not needing to reprogram, but I haven't heard this.)

If it's a non-CA key, then the process has many opportunities for error, so you'll need to describe what you've done.

ctuna · 10-09-2022, 01:38 PM

No to the fob reprogramming after battery replacement.
If both fobs are not working it's probably not the Fobs.
more likely the diversity antenna to connection to it.
Is that how it started out with both Fobs not working?

Easy to knock small components off when replacing the rechargeable battery .

All Fobs have a trandponder that will work when the Fob is inserted in the Dash slot.
Even with a dead battery.

10-09-2022, 07:55 AM	#1
navydoug33309 Registered 0 Rep 3 Posts Drives: 2008 328i bmw Join Date: Jun 2021 Location: ft lauderdale fl iTrader: (0) Garage List 2008 BMW 328i [0.00]	2008 E() Fob new battery I recenetly installed two new 2022 batteries in my fobs......they dont work, i read you need to "reprogram" after replacing the batteries. HAs anyone else sucessfully completed new batteries installed in your FOBS ? thnx
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10-09-2022, 10:03 AM	#2
e90yyc Art Collector 2427 Rep 3,450 Posts Drives: 2007 328xi (GM-delete 6MT) Join Date: Feb 2018 Location: Canada iTrader: (0)	You don't mention whether it's a CA or non-CA key. Regardless, reprogramming should not be required for a simple battery replacement. If you have CA keys, try putting one in the slot and starting the car that way. Then see if it works. If it won't work, put it in the slot and hold down the START/STOP button and see if it eventually turns over. Then once you've successfully started the car, try the key out again for regular lock/unlock functions. (I could be wrong about not needing to reprogram, but I haven't heard this.) If it's a non-CA key, then the process has many opportunities for error, so you'll need to describe what you've done. __________________ When I'm dead, just throw me in the trash.
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10-09-2022, 01:38 PM	#3
ctuna Lieutenant General 1921 Rep 13,128 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	No to the fob reprogramming after battery replacement. If both fobs are not working it's probably not the Fobs. more likely the diversity antenna to connection to it. Is that how it started out with both Fobs not working? Easy to knock small components off when replacing the rechargeable battery . All Fobs have a trandponder that will work when the Fob is inserted in the Dash slot. Even with a dead battery.
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