Hello

I got an fault code on sos system that battery is bad and has to be replaced , where is battery located ?

Thanks for help / Peter

Situation in Kamiq, maybe is same in Fabia:

Peter if that video doesn't sort you then this subject has been covered a couple of times before, if not here then in the 'General Maintenance' or perhaps(?) 'Diagnostics & VCDS' forums.

Good luck, let us know how you get on.

The B1916F4 code was also discussed on the BRISKODA Scala sub-forum

https://www.briskoda.net/forums/topic/533271-backup-battery-service-life-critical/#comment-5951331

(I think the location of the back-up battery was not covered.)

GOOGLE AI Overview below:

Fault code B1916F4 indicates a "Backup battery - Service life critical" error in the Telematics (SOS/eCall) module, commonly affecting VW Group vehicles (VW, Audi, Skoda, Seat). This means the internal, rechargeable battery for the emergency call system has failed, degraded, or cannot hold a charge, requiring replacement.

Key Information regarding B1916F4:

• Symptoms: "Emergency call function: fault" message on the dash, red SOS light, and potential battery drain if the system tries to charge the dead backup unit.

• Cause: The small, internal battery within the SOS control module (often located under the roof console or rear bench) has reached the end of its life (typically 3–6 years).

• Fix: The physical battery must be replaced (part number 3G091589 is common).

• Software Requirement: After physical replacement, the new battery must be initialized using a diagnostic tool like ODIS to clear the "service life critical" status, otherwise the fault code will remain.

• DIY Note: While the battery can be replaced physically, the necessary software reset makes this difficult without professional tools.

Edited 3 March3 Mar by DerekU

@DerekU thanks for finding that. Location in Scala - https://www.briskoda.net/forums/topic/533271-backup-battery-service-life-critical/#findComment-5952186 - [ETA: I was still typing and checking hyperlinks work when you posted]

@peter77 See this for solution (yet another 12v battery charging need) - [ETA: if AI isn't correct on this one unique occasion of course]

"The solution, according to the workshop manual and today's words from a technician at a Škoda car service, is this: With the ignition on, let the vehicle battery charge for two hours." - https://www.briskoda.net/forums/topic/533271-backup-battery-service-life-critical/#findComment-5952375

HTH.

Edited 3 March3 Mar by nta16
ETA:

I check status on the battery and it looks good 🤔 It seems like there has been a glitch in the system, how do I reset the system? There are 3 options to choose from in odb11, soft reset, reset and hard reset?

Has your car had a VW update type of glitch by any chance.

By those readings isn't that it, it's done. Have you driven the car since whatever you have done to let the very dumb computer systems know and confirm things are OK and no need to panic.

If the doom light has remained on or remains on after driving the car perhaps through a few stop/start and/or ignition on/off cycle over a reasonable distance drive then your best bet might be to have a look at the OBDElevern forum for what other OBDEleven user found and done. Of course you will need the correct OBDEleven hardware and software systems and may want to do a full back-up before pressing any buttons.

Good luck, let us know how you get on.

I fixed problem , thank all you for help 🙂

5 hours ago, Peter7705 said:

I fixed problem , thank all you for help 🙂

Good news - what fixed it in the end, so that others will know the solution.