Barbara Ellen was driving her daughter’s newish Chevy when the engine idiot light came on. She drove to AutoZone and had them examine the engine’s computer for “the code” that explained the light.
Seems to be something called “the impulse valve” which relates to the exhaust not the engine itself. So daughter is now equipped to take the car to a mechanic to knowledgeably ask for a fix. BE and daughter dislike going to dealers. They prefer AutoZone’s tipoff.
Seems like pure magic to me. My 14-year-old CRV has some computers in it, particularly the ignition key, but not this level of sophistication.