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CEL 1997 ZJ 4.0

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SteveTheFolkie:
Had a CEL come on on my '97 ZJ 4.0 - any way to read this without an OBD2 computer hookup?  Funny thing is - CEL came on - performance and mileage improved (from 18.9 to 19.6!) - not sure if I want to "Fix" what's wrong or just put some tape over the CEL!

Cheers

Steve

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