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Originally Posted by eriktherod
Kind of reminds me of the age-old way of "troubleshooting" computers -- beep codes. That was one of the few things that learning in early 2003 that still applies today. The rest as far as IRQ and interrupts don't ever really come up as potential issues nowadays.
It always irked me because beep codes (like CELs) vary from manufacturer and some aren't even used at all anymore. Newer motherboards are starting to feature a double-digit (seven segment LEDs) code that tells you what is going on. I upgraded my brother's PC recently and got a board with this feature, REALLY helpful.
Most things are going towards being more open, the car manufacturers should embrace it a bit more. They don't need to have everything exposed, but most cars should be able to at least display the CEL on the radio or another screen (like all those ones Hondas come with now). It's stupid that you even need to pay somebody $X to get that code for you, just a grotesque rip-off.
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Oddly enough on my wife's 2005 Legacy you can open a panel by the driver's knee and connect two cables, with that done you can get it to display codes on the dash display. It was strange.
Other cars sometimes have similar things. Some require pressing the trip reset right after turning the ignition or something like that. It still only gets you as far as the codes. Often times several things get OR'ed into a given code and even obvious seeming codes (like a knock sensor code) could mean anything from a sensor problem to something more obnoxious.