Tnx for the run-down on the car . . . makes it much easier to give you some suggestions.
Reset the codes, after replaceing the battery . . .
Your FIRST job is to replace the wiring harness and then the O2 sensor and you might be good to go!
If the ETA is bad, you will get the #6 code and the same codes shown in MENU#24 but with the car sitting that long, it may be just "inactivity".
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Regards . . . . JimF
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'94 S500 Cpe
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