E92 320 Coupe Battery Blues

[lofty]

hello all lofty here

Does anyone know why my e92 320d coupe keeps flagging up that it needs a new battery, i have had the battery tested and there's nothing wrong with it, yet it keeps dumping my clock settings every day. its been doing this now for over a year. I am reluctant to take it to main dealer as they want silly money and as i say the battery is as good now as it was when i bought the car 3 years ago it starts first time every time even when its freezing cold as it is today.

If i change the battery myself do i have to tell the ecu its had a new battery if so how do i do that ?.

I would be grateful for any advice

kind regards Lofty

[Guest Mister Dabsy]

If the battery proven good then it must be either a module, wiring or fuse issue... Damp, poor connections etc

[lofty]

Thanks Dabsy

Thanks for the advice but all seems well in battery compartment, no damp or loose connections as soon as i get a chance ill buy a new battery from discount shop and see if that makes a difference. At least it will rule battery out, does anyone know if i have to tell its brain its had a new battery and if so how ?.

"Condition based service" bah humbug.

regards

lofty

[Guest Mister Dabsy]

The ECU doesn't recognise new batteries however, anyone can tell you that BMW's are finicky if the ampage is insufficient or drops !!

I use slightly higher rated batteries, for example if the standard replacement battery was a 680CCA then obviously bob a 700CCA or thereabouts, not much higher though or the alternator will complain and ask for overtime pay :lol:

[lofty]

Thanks again Dabsy

Thanks for the advice ill do as you say get a higher spec battery next week ill let you know the outcome .

happy new year to you

regards lofty

[Guest Mister Dabsy]

Have your current battery stress-tested first, it may not be the fault but at least you'll know ;)

If you decide to get a new one then charge the old one and store it in a dry place for a week and check it again ;)