Water Temp Sensor it sounds like! It tells the CIS-E controller to fire the cold start injector and also lets the CIS-E system know what temp the engine is to adjust mixture via the EHA!

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....