engin light comes on Options

[Dragondog]

my engin light comes on sometimes then other times its off i took it to auto zone the say car is to old to connect comp. to they say i need to spen bout 75 for a diag. im not going to spend that much just to find it was an oxegen senser....witch is what i think it is car runs great....also has an open exahust if that makes a diff...if any one has info to what i could be plz tell so i can get on it i hate seeing engin lights

[Gary]

The diagnostic box is in your engine bay.
It is a grey plastic box.
Open it up and you will see a terminal label under the cap.
Jump TE1 and E1 port with a paper clip or wire.
Turn the key to "ON" position, and see if the engine light blinks.
Example,
** * and repeating, you have code 21
If ** * ***** ** and repeating, you have code 21 and 52