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Does disconnecting the negative battery terminal reset the ECU?
Just a quick note on this - any car sold in the UK has to be capable of running on 95 RON fuel without damage. The 1er may prefer 97/98 and BMW may recommend it, but it'll run fine on 95, perhaps with the edge taken off it. I ran my 130i for 6 months on 95 RON until recently; now I only feed it 97/98 and the improvement was immediately noticeable (not huge, but noticeable). I didn't reset the ECU or anything, just drove it.AndyM said:This can be useful when changing from standard unleaded to super unleaded but that isn't a concern as the 1 is meant to always be driven using super.