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Originally Posted by Colink No the car was never attempted to be jumped because the battery was new and all the lights and everything was on. |
Unless the battery was checked with a voltage meter, jump starting may help identify the issue if the alternator which charges the battery when driving is operational or not.
If the battery stopped charging because of the alternator, it may not have enough juice to turn the crank and starter motor over.
It's a quick and simple enough diagnostic that it's worth trying if it saves you $3,000.
My understanding 318ti's in the US cost around $5,000. You need to weigh your options to decide how much you're willing to spend to resolve this issue.
My opinion is to take it to someone who knows what they're doing. The dealership is probably paying an under paid apprentice to diagnose your problem.