“There are 127 different things that can trigger that light.”
While waiting for my car to be inspected this morning, I overheard one of the service representatives telling someone on the phone that this is why she had to pay $75/hour just to have a mechanic figure out what was wrong with her car. This might seem excessive, but so does the alternative (in my mind) of placing 127 different indicator lights on the dashboard. But there has to be a middle ground.
What irks me most about my car and its system of warning lights is that they aren’t consistently helpful to me. When the Fuel Empty indicator comes on, I might reasonably be expected to pull over and get gas immediately. But I know from experience that I can, in fact, safely drive another 20-30 miles before my gas tank is actually empty. In that regard the system works well from a usability perspective: Inform users of errors, offer instructions on how to correct the error. “You’re almost out of gas, get some” the car is telling me. “Almost” is helpful here because experience has allowed me to learn what it means. Certainly I could stop and fill the tank right away, but I know that I don’t have to.
Compare this to the Check Engine light. When it comes on, there’s absolutely no information immediately available to help tell me what might actually be wrong. Checking in the owner’s manual as to its meaning, I find that the its illumination on my dashboard indicates that I should “take the car to the nearest service station” and have the problem checked out.
That’s just great. Prudence demands that I do so, but it would be FAR more helpful if the car offered me some context. The Check Engine is yellow, like the Fuel Empty, but there’s no indication of what it might mean to “almost have some engine trouble, get it checked.” Is my engine almost about to explode? Or is it just that my fuel-air mixture is a little high, and I might be using gas a little inefficiently? No context, no clue – no help.
Now I know that diagnosing engine trouble is no easy task, and I can appreciate the skill it takes to do so. I don’t expect the job to be automated such that my car will tell me “the engine seems to be misfiring, perhaps you need new sparkplugs.” But a little contextual information, beyond the simple red-yellow color coding (red usually means “pull the car over and have it towed”) seems appropriate.
Does anyone know of a car that currently does this? Does anyone have sufficient experience with automotive diagnostic tools to offer an opinion as to whether or not I’m asking too much? Really, all I want my car to say is something like “based on what’s indicated, there’s a 5/50/90% chance that your car will stop running if you don’t have this fixed right now”. Given even that small, and relatively imprecise estimate of the severity of the situation, I’d be much better equipped to make the call on my own.