this post was submitted on 20 Dec 2024
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Showerthoughts
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The same reason they won't let you buy the dealership scan software for under 10k. Almost every maker has an in house scanner and due to standards they only need to provide certain data to non dealer level tools and I believe the standard only exists for gas powered vehicles that need to provide OBD2 data. Plenty of makers (BMW is horrible about this) stuff away data where a normal obd scanner just won't access and it's gotten much worse with the overuse of CANBus (I sure love when my trunk lid sensor prevents my fucking car from starting).
Thats where your snapon and other third party scanners start bringing a gap, but even those are extremely pricey and need to be updated constantly and even those usually won't do EVERYTHING.
Fwiw the cheapest and best way I've found is basically to pirate the dealer software and get a compatible knockoff scanner (vxdiag for example). I have Ford IDS and a couple others this way but assume that the software is gonna install something malicious and dedicate an old Thinkpad or something to it.
Depending on the age of your vehicle something like Torque Pro is extremely useful. I have mine monitoring transmission temp, long and short term fuel trims, O2 sensor signals, voltage, mass air speed, intake temp. It's more than enough data to see something coming long before it becomes an issue.
If you have a Ford, there's free software called Forscan that will perform all of the duties of the dealer service software. I used it when I replaced my wife's ABS module on her Edge. You can even use it to program keys and modify things.
Yep FORScan let me set the VIN on an electronic power steering rack (because that's totally cool to require so you can't just replace it at home right?).
I beleive it is actually IDS just reverse engineered and more accessible, unfortunately not every maker has one of those out there it really should be legally required when you buy the car to at least get the software to "own" it.
Yeah I was so psyched when I came across it while trying to diagnose the ABS issue. I searched for something similar for Toyota and Chevy for our other cars but was bummed that nothing like it exists for either one.