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In an OBD 1 system you should be able to disconnect the battery for a few moments, and the codes should clear from the computer. Have you tried Jumping pins A and B on the OBD connector and watching the dash light? It will flash out the code. Im sure there is a Thread somewhere explaining this in more detail then I am.
How long did you disconnect the battery? Even if you leave the battery disconnected over night and it clears the code, it will reset the code when you start driving again if there is a fault.