I don't really buy the idea that modern cars cannot be repaired by an independent or shade-tree mechanic. Sure, engine electronics are more tightly integrated,

I don't really buy the idea that modern cars cannot be repaired by an independent or shade-tree mechanic. Sure, engine electronics are more tightly integrated, and may be engineered to 'require' an expensive tester, but there are still loads of things that a mechanic can do. Pulling transmissions, replacing clutches, timing belts, steering pumps, CV joints, oxygen sensors, etc. I waste time fixing a 30 year old vehicle because it's a fun pastime for me. They don't do it because it's just more of what they do all day.