Join Date: Mar 2006
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With the warning light on, it won't necessarily be in safe mode - that would depend on the severity of any other problem.
No harm in leaving the battery disconnected for longer and trying the car over a 100 miles or so, but I think the best way forward after that will be to get it booked in for having the light reset, at the same time ask them if anything else is recorded as being faulty. And you DON'T have to go the dealers for this... any independent with the diagnostics computers can do it.
Currently in TazzyK's garage:
Renault Clio 1.4 16v Privilege (2004), Renault Megane 1.5 dCi 106 Expression (2005), Volkswagon Passat 2.0 TDi S (2006), Alfa Romeo 159 2.4 JTDm QTronic Lusso (2008)