My car is mid 00s. I think I can do all of my scanning with a $10 OBD2 sensor. What year did cars really start requiring $3k scanners to diagnose and fix?
Or does my mid-00 car also require a scanner, and I’m just ignorant of their usage?
These days you can get pretty good readers that can scan for everything. Older/cheaper readers usually only scan engine codes. The newer/better ones scan engine, abs, srs, and transmission.
They can usually reset most (but not necessarily) all codes/code types.
The better ones ($100 to $200+) even have minimal bi-directional capability, like automated brake bleeding, battery reset, etc.
Depending on how deep of a dive you do with your car, that may be all that you need.
Full bi-directional capability allows you to test/control stuff like relays, actuators, etc. (like for testing evap systems) For most DIYers, you don't need to spend $3k on the big boy scanners, almost everybody makes a "mid-tier" scanner like the Autel MK, Launch, Topdon, etc. that runs in the neighborhood of $650ish - $800ish.
I think most can get by with the upper-end diy models that does some (but not all/a lot) of bi directional functions so you can do an abs bleed if needed, etc. If you maintain your car well and it's generally reliable, the likelihood of having to go mid-tier is fairly low.
When I got my DS808, it was more because I like toys (this is a forum about tools, after all). As far as ADVANCED bi-directional uses, the only thing I've ever needed more advanced functioning for was when my daughters Nissan was throwing an evap code, so I could shut the valve down and smoke it. Yes, I got myself an OTC smoke machine as well, just for that. It was used, and the only time I've used it so far. Also, if you considered entering TPMS ids via OBD an advanced function, but I THINK there are cheaper models that can even do that these days.