this post was submitted on 04 Oct 2025
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To be clear, I agree it’s important for mechanics to be able to read the codes, but disagree about consumers. I might do it since that’s gotten cheap and I like to see data but don’t expect it to be useful.
Basically if it’s easy enough to do myself, reading the code doesn’t usually help diagnose. If reading the code helps diagnose, the chances are tiny that it’s something I can work on. Obviously there are people who do a lot more of their own car repairs
It's a good skill to know so you don't get ripped off. You can find the most likely culprit and look up the book time and parts cost. Then go to the mechanic and don't tell them you know. Just say the light is on. If they come back with some wild price for the issues, then you can tell them to put the car outside and you'll come pick it up.