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There is a small black box under the hood located by the driver side strut tower. The black box (diagnostic box) is only about one inch by 2 inches. If you open the cover to the box you will see a few rows of electrical connectors and on the underside of the "diagnostic box" cover there should be a sticker with a letter and possibly a number that identifys all of those electrical connectors in the box. Take a paper clip and bend it into a "U" shape. Take the paper clip and connect the electrical connector "T1" to "E1" (look at the sticker under the cover). Its possible they may be labeled slightly different, like "Te" or "Te1" or "E". Get a pen and paper and sit in the driver seat of the car. Turn the ignition key to "run" (thats where the dash lights up and the buzzer for ignition and door being open are beeping. DO NOT START ENGINE at this time. You should see the "Service Engine Soon" light start flashing. If not flashing you need to go reconnect the paperclip again. the number of flashes indicates which code it is and what the fault is. For example if you see "flash, flash"....flash, flash, flash" That is code 23. All of the codes will be 2 digits. You should see the same code flash 3 times before the next code is displayed (there may be only one code or lots of them). Then you need to find out what the code means (what the problem is) by either searching online, buying a repair manual for your car and look up the code or call the auto parts store and ask them. You may want to try clearing the codes as described below and if the light doesn't come back on Yipee it's fixed. If you think you have fixed the fault (made the repair) you can reset (clear out the codes) in the computer by removing EFI 15 amp fuse from fuse panel in the engine compartment for 30 seconds. Use the paperclip and jumper the connectors mentioned above, the turn the key to run (NOT START)and if the computer is cleared of all codes the "Service engine soon" light will just do a "flash,flash,flash,flash,flash,flash" with no pause in between. If you get the "flash, flash....flash, flash, flash" then you need to remove EFI 15 amp fuse for a while longer to clear the codes from the computer. Turn off the key and remove the paper clip, Start up the engine and if the light stays out, you have fixed your problem. If the light comes back on you will need to do the paper clip trick again and see what the code is this time. It maybe the same old code(s) or a new code. Good Luck!!
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