Ask HN: Why don't modern vehicles show detailed engine codes?

My old i3 BMW also had a service menu that you could access after pressing a button for a while and entering a password that was some kind of checksum of the VIN.

But an ODB2 dongle is probably something important to have in your toolbox.

And for a new car, you may prefer to let the company fix it under warranty while you get a loaner.

* Better for mechanics as it’s standardized and they don’t have to figure out the UI of every car model to read the codes (if I were a mechanic I’d definitely prefer just plugging in the meter)

* The debugging is decoupled from the infotainment/dash so it’s more reliable, it would be pretty dumb if you had to have a working infotainment system to read engine codes

* An OBD meter is like $20?

* Historically a lot of cars probably had no display for showing codes

Reduction in chances the vehicle owner will take the vehicle into the dealership for servicing and up-selling.

As a side note and FWIW many vehicles do have button/key combinations that will display this data. Youtube is full of videos that show how to enable displaying them and how to perform many undocumented settings on most vehicles. Even my 25 year old vehicle has debugging functions that can be enabled by holding in the odometer button, turning the ignition switch to ON and waiting 7 seconds.

https://mechanicbase.com/cars/dashboard-symbols-warning-ligh...

Oh, yeah, we don't do that either.

Prolly has more to do with someone getting paid to read those codes for you.

Because it would be of no benefit to repair technicians.

Because everyone who wants to know the code behind the light can buy an OBD reader.