> Now, you get a check engine light and the code reader says, in so many words: “bring to dealer and pay up” That's funny, because my OBDII reader tells me exa

> Now, you get a check engine light and the code reader says, in so many words: “bring to dealer and pay up” That's funny, because my OBDII reader tells me exactly which sensor logged a fault and what the fault is such as reading too high/low. Sure you can have oddball errors where a bus wire has its insulation melted and is sending noise over the CAN bus or something, but you also had bizarre issues on old engines with weird vacuum leaks in pipes and dashpots and all the other analogue junk that electronics have replaced. People look at old cars through rose coloured glasses and forget having to clean distributors and adjust timing and fix tuning drift with carburettors.