The sensor to the right is the coolant temp sensor, which will have a bad influence on your gas milage if it's not working.
I just replaced mine. It did not help my poor gas milage problem (which therefore must be caused by something else), but it did help a lot on my cold start problem.
It does NOT come with plugs/wiring!
Never criticize someone until you've walked a mile in his shoes. That way, when you do, you're a mile away -and you have his shoes!
'86 300E optically converted to '95 E300 (Sold)
-Blauschwarz on silver
-17" AMG & 15" AMG for winter