do you set battery code every time battery is disconected

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Mar 15, 2022 | 08:25 PM

rover1man

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do you set battery code every time battery is disconected

Hello,
Audi Q7 2007 4.2 v8. I know you have to set a battery code in VCDS when a new battery installed.

Is it necessary when the battery is disconnected every time?

I have been chasing a power drain problem and have been removing the battery posts when charging the battery.

thanks

Mar 15, 2022 | 10:05 PM

Raj800

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Joined: Jan 2022

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From: Melbourne

Quote:

Originally Posted by rover1man

id it’s the same battery I reckon you don’t have to

Mar 16, 2022 | 05:48 AM

captain_video

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No, only when you replace it

Mar 20, 2022 | 10:21 AM

'10Q7TDI_Prestige'

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From: USA - NM

Battery Drains & Q7s

Quote:

Originally Posted by rover1man

No, just when you change the battery out, or if you are trying to get the maximum amps charge rate out of the BEM system to 'boost' your older battery recovering from parasitic drains, you can change the last digit in the serial # entered, etc., to 'trick' the car into thinking it's been changed out.
You should have duplicate battery posts up by the firewall, under the 'bonnet'/hood, so you don't need to disconnect the actual battery posts to charge it, as that is going to throw a trouble code out on just about every major system on this car, which then all have to be cleared. So far as battery drains go, by far the most common on the Q7 are the door handle sensors...they go bad on all Q7s. If you will search for "Got Parasitic Battery Drains", I created a thread just to help resolve this specific issue quickly, and without cost...it literally takes about 15 minutes to do all four doors. You should scan the car with a VAG-compatible diagnostic scantool first, of course, which will show you which specific doors have 'grounded-out', and are creating the parasitic drains.

Last edited by '10Q7TDI_Prestige'; Mar 20, 2022 at 10:27 AM.