It is named strangely. It is called the Water Temp Sensor, but in all honesty it is for the Fuel System. This is what tells the CIS-E controller the temp of the engine to determine if the cold start enrichment is needed or not and to keep the air/fuel mixture enriched until the engine reaches 60 degrees. Then enrichment is cut and normal operation is started. It also will have the ECU lean the mixture when the engine temp is over 100 degrees. They came in two flavors. One two prong plug, with two individual posts that are water tight connectors. And a four pin version that had a round top and water tght connector.

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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.....