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Old 02.02.2021, 10:03
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Battery Change Coding?

Going to swap out the battery in my 2012 Passat for a new one, and believe I need to code it anew to the car. Wondered if anyone here - relatively close to Aigle, Vaud - has VCDS or something like that and would be willing to code it for me once I've made the change - for a consideration of course or a nice bottle of wine? Aware it is a simple job but don't have the kit myself.
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Old 02.02.2021, 10:08
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Re: Battery Change Coding?

Is the radio code not somewhere in the service manual?
If not, a call to a friendly VAG person will also get the code.
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Old 02.02.2021, 10:47
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Re: Battery Change Coding?

Thanks for the reply! Just to be clear though, I was talking about coding the new battery to the car. You need to plug an appropriate scanner or a laptop with VCDS into the car and enter a new code.
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Old 02.02.2021, 10:49
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Is the radio code not somewhere in the service manual?
It should certainly have been supplied, if that's what he's referring to, but TBH I didn't think most cars, now with built-in radio/nav head units, not removable ones that need anti-theft protection, don't even have this sort of coding.

Other than that, a new battery shouldn't itself need anything resetting or coding, so I'm not sure what else the OP could be referring to.

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Thanks for the reply! Just to be clear though, I was talking about coding the new battery to the car. You need to plug an appropriate scanner or a laptop with VCDS into the car and enter a new code.
Wha? Naah, I don't think so, although TBH the most modern VAG car I've changed the battery on is my wife's 2010 Audi, but a battery is a battery, the car's systems won't be able to tell if its the same one or a new replacement, as long as it delivers the required voltage.

Or am I hopelessly out of touch?
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Old 02.02.2021, 11:02
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Re: Battery Change Coding?

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am I hopelessly out of touch?
Seems so:

https://www.audi-sport.net/xf/thread...quired.203475/

Tom
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Old 02.02.2021, 11:20
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Re: Battery Change Coding?

Even on the discussion you linked to there doesn't seem to be a consensus, with many folks saying the car will "learn" the new battery after a while. But at least there is some explanation of what this is referring to.
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Old 02.02.2021, 11:57
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Re: Battery Change Coding?

Quote:
Even on the discussion you linked to there doesn't seem to be a consensus, with many folks saying the car will "learn" the new battery after a while. But at least there is some explanation of what this is referring to.
18 months ago I bought a 2010 Audi A3 with non working stop start. I did not code the new battery when I installed it, within 3 weeks the car had realised & the stop start started to work.

I since bought this on Amazon to turn off the service light & it can also code the battery , correct milage etc. https://www.amazon.co.uk/gp/product/...?ie=UTF8&psc=1
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Old 02.02.2021, 12:11
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Re: Battery Change Coding?

Thanks for all the replies. Yes, you're right - some people say the car will 'learn' the new battery (presumably due to voltage/current it registers in different situations) through the battery monitoring module - which my car, a 2012 2.0TDI BlueMotion) has. Other people say that if this is not done, then battery won't charge properly/damage could ensue, thus code it to be on the safe side. Who to trust on the internet?

https://www.passatworld.com/threads/...estion.549138/

If I don't find any way to code it, I'll probably just drop in the new battery, drive about a bit and hope the for the best. Cars are way too complicated today, oh for the good old days...
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Old 02.02.2021, 12:17
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Re: Battery Change Coding?

better to code it. particularly if the old battery was already poor. it will throw all sorts of periodic errors otherwise.

Ace1 - yes, you're hopelessly out of touch. As in 20 years out of touch.
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Old 02.02.2021, 12:28
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Re: Battery Change Coding?

Quote:
Wha? Naah, I don't think so, although TBH the most modern VAG car I've changed the battery on is my wife's 2010 Audi, but a battery is a battery, the car's systems won't be able to tell if its the same one or a new replacement, as long as it delivers the required voltage.

Or am I hopelessly out of touch?

Hopelessly Best is to have it coded correctly. VAGs have some battery management software to adapt charge rates depending on the age and condition of the battery.
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Old 02.02.2021, 12:37
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Re: Battery Change Coding?

Thanks! Yeah, wife has encouraged me to change my mind. Main issue is that with my job/fam I simply don't have much free time to expend on the issue. Just going to swallow the higher bill and get it done by my local friendly, and pretty competent, garage.
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