Engine light comes on

[avitsefman]

How do I acess the computer to find out what the light is coming on about? I think it may be the O2 sensor as the engine is running rich at various times(tail pipe sooted up).Any help will be appreiated.Thanks!

[BigWheel]

What year is the car? Is it EFI or Carbed? I have a '93 with EFI. Take a jumper wire and run from your STI terminal to an engine ground. Get in the car and turn the key on (without starting the engine). Your check engine light should start blinking. The first number of the eng trouble code will be long duration blinks and the second number will be short flashes (if single digit it will be short flashes only). Count the number of flashes for your code then check against the Haynes Manual.