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Originally Posted by Pigrider
My 94 has had the same problem for 3 years now. I had a crate motor put in so I know the engine is fine. It's just one of the "smog" sensors malfunctioning. Was told not to worry about it. The Merc dealer wanted $500 to change the thing and wouldn't guarantee that it would fix the lite problem
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Finally figured it out......FYI
The EGR ports were clogged up. Cleaned them up of carbon and she's good as new! Light hasn't come on again for a month now.
Thanks for all the help,
Chuck