> You plug it in, it gives you a diag plan, and you follow it. To venture away from this you need to ask permission. That was my German car stealership experie

> You plug it in, it gives you a diag plan, and you follow it. To venture away from this you need to ask permission. That was my German car stealership experience. Car suddenly sounds rough and reports cylinder 1 misfire. I swap around sparkies and coil packs, but still cyl 1 misfire. I write that up, go to dealership because this is beyond me and I figure they have fancier tools than my $20 reader. But for $250 they obviously didn’t read my note and advised replacing sparkies and coil packs even though I’ve 100% excluded those as the cause. And obviously if they had the tools to test a spark plug or coil back, they didn’t use them either. Their flowcharts not only lobotomize their techs, but have taken the place of basic troubleshooting techniques. Next indy read my notes and immediately does a compression test showing cyl 1 holds no pressure. Even sent pictures. Correct diagnosis was failed exhaust valve spring. $2k later and I’m back in order. I shudder to think the stealership could even tear down and rebuild their engine that way.