They hooked up to the OBDII and ran a diagnostic tool and it told them exactly where to look and charged you $250.
Honestly, I'm usually fine paying an honest professional a few hundred bucks to do something simple that'd take me a few hundred hours to work out. Time is money.
You're being pedantic. No, OBD2 can't tell you exactly which wire is corroded or shorted, but it can tell you exactly which subsystem is throwing errors or non-standard codes, which tells you where to look for issues.
It's the same as saying eventvwr can't tell you which piece of hardware is failing. Of course it can't, but it will tell you what piece of hardware to look at and test, rather than running every single diagnostic possible in the hopes of finding the fault via the scattergun approach.
That's not at all how obd2 works. There is a quite a lot more than just... Oh it has a fault for this. Must need to be replaced. If he's half a good mechanic he'll be testing to make sure the sensor with the fault is receiving mechanical input properly from whatever it's supposed to sense. Then that sensor has to send that info to the controlling module. He should be testing it gets received and interpreted properly. If something in that line of info isn't working, you've got a power, signal, and ground wire to test on the sensor, the module, and the plugs that connect them. And that's if it is something straight forward. There are far more annoying problems that only present intermittently. Not knowing what goes on doesn't mean nothing is going on.
That's fucking silly. Clearly you have some vague idea of what it means to be a mechanic or even how to fix cars, but literally zero experience doing it. You do you, man. Clearly you've been burned before. I can understand the way you feel. As someone who runs an honest shop that really just wants to help people, this is some asinine non-sense you're talking. Regardless, it wouldn't stop me from doing everything in my power to make sure you had a safe and reliable car if it comes through my shop.
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