You can buy code readers for most cars these days. Usually for less than
the cost of an oil service at a dealer.

The fact is like many things these days, most can't be bothered to learn
how a car works. Far more fun as a kid playing computer games.

My £17 OBD2 scanner saved me a fortune recently........crankshaft sensor and
MAF failure on the 17 year old merc and the heated o2 sensor on the wagon R
....parts are cheap........