[Dean Stephens]

The new battery should not affect the idling.

Fitting a new battery will affect the idle speed - The procedure to reset the idle speed is detailed in the owners manual - if you have it. If this does not work (as in my case with my previous 2,0L iO) a 2 second visit to the local agent sorted the problem. If you need a copy of the relevant pages of the owners manual just shout and I will post them here. Changed the battery on my new old 3,2 and the reset procedure went without a hitch.

I don't know about the io but the gen2 V6 engines have a stepper motor that electronically controls the idle speed. There is an adjustment screw on the throttle body but in most scenarios that should never be touched from the factory setting.

The 3.2 Di-D pre-common rail and the common rail's idle is fully controlled by the ecu.

The every basic steps to follow to reset the engine speed after battery replacement in both the iO and the 3,2 owners manuals are exactly the same

[4ePikanini]

That confirms that the ecu will sort it out unless something is wrong.

[RoelfleRoux]

All that article could have said is: "Don't tamper"