Changing a battery

[vespa]

This may sound a stupid question, but is changing the battery straight forward ie undoing the two contacts +/- and securing plate and nut. Or is it more involved such as reprogramming the radio etc if power is interrupted? (nothing seems straightforward these days)

Car 2.0Ltr TDi Highline 140 2009

[itavaltalainen]

Is it a blue motion model with stop start?

If yes then you will need to code the new battery in energy management control unit (you need a battery with a special code on it too).

[vespa]

Is it a blue motion model with stop start?

If yes then you will need to code the new battery in energy management control unit (you need a battery with a special code on it too).
No, it is a Highline DPF fitted with the satnav console. I have read that it will need the reprog of the satnav/radio and something to do with windows and doors.

[skomedal]

Changed the battery on my 06 2liter 140 tdi comfortline wagon. Just disconnected the terminals removed the holder plate, fitted new battery no need to reprogram anything apart from the clock, got a few warning lights but cured this by driving ~100 meters.

No other problems.

Hope this helps.

[itavaltalainen]

push the window switch till windows are completely down, then up switch till they are completely up again.

sat nav you may need to reset clock, not sure what else would need resetting.

[Quatrelle]

Changed the battery on my 06 2liter 140 tdi comfortline wagon. Just disconnected the terminals removed the holder plate, fitted new battery no need to reprogram anything apart from the clock, got a few warning lights but cured this by driving ~100 meters.

No other problems.

Hope this helps.

Same car, and no problems - although I seem to recall that I did have a problem undoing the bolts holding the terminal clamps. Can't remember why.

[skomedal]

Same car, and no problems - although I seem to recall that I did have a problem undoing the bolts holding the terminal clamps. Can't remember why.

Think you had problems removing the the battery holder plate, this space is very access restricted if you do not want to loose the bolt and plate into the engine well.

Solved this by inserting a small neodymium magnet into the socket wrench whilst using a very large neodymium magnet on thick fishing line on the plate itself, same in reverse when fixing in place again.

[Alex jb]

There is 'setting saver' devices which are basically a coffee mug sized 12v battery with wires and little crocodile clips. You clip it on the leads then remove the leads from your main battery and you loose no settings.
As technology moves on and ECM's monitor battery voltage, these simple aids are going to become obsolete though!



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[vespa]

Thank you all for your input on this. It used to be a simple matter of changing a battery but as technologies have progressed there seem to be laots of little extra bits to consider.

[Alex jb]

Thank you all for your input on this. It used to be a simple matter of changing a battery but as technologies have progressed there seem to be laots of little extra bits to consider.

Definately!

I had a MK4 golf before my A4, I'm gutted how integrated the audio is in comparison. All the CANbus communication makes it super expensive to upgrade.


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[Quatrelle]

Think you had problems removing the the battery holder plate, this space is very access restricted if you do not want to loose the bolt and plate into the engine well.

Solved this by inserting a small neodymium magnet into the socket wrench whilst using a very large neodymium magnet on thick fishing line on the plate itself, same in reverse when fixing in place again.
No, definitely the bolt on the back (earth) post (just had a look). It was as if the nut was cross-threaded - it was so difficult to turn that the square 'captive' bolt turned with it. I replaced it with a conventional nut and bolt, since the same thing happened when I tried to tighten it back up. This was the first time I had touched it from new. The front one was similarly tight, although I managed to loosen that eventually.

At least I know I'll be able to use my emergency 10mm spanner if the need arises.

I wondered after if they were deliberately made like that to stop them becoming loose inadvertently.

[MDA123]

I tried undoing the bolts on my battery (to fit a permanent cable to attach a maintenance charger) but I couldn't get the nuts off. They loosened and I could almost undo them completely but the nuts simply would not come off the last few threads. I managed to force one off with a pair of pliers but it basically destroyed the threads and yes, the captive square head kept turning round!

[itavaltalainen]

How did you do that?
Never managed to do that before. Replaced the square head bolts with a normal hex head screw and hammer it in.