You don't say what country you are in, what your price range is,
what "smaller" means, and a lot of other stuff.
IMO, other than brakes, cooling system and suspension, no modern
BMW is easy for *ANY* person to work on, as they all require
a $50K computer diagnostic console.
BTW, what does "SW" stand for?
Diagnostics simply make diagnosing a fault quicker. And I've got a Peak
Research reader for mine which cost about $150 and gives most codes. But
I've only really used it once - to confirm my diagnosis of a faulty crank
*(on a baby-size shirt) "Party -- my crib -- two a.m
Dave Plowman email@example.com London SW
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