I'm not sure about the battery disconnection idea, as SpannerJuggler pointed out on another thread, for quite a few years now ECUs have stored their fault codes on EEPROMs (like Flash Memory) which don't require a poser supply to preserve their contents.

Plugging in a code reader to find out what the problem is is the only real option, but as the car's under warranty, then this is probably best done by the dealer.


Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 2022 Mini Cooper SE