Yes, the 190e is a 2.3 litre.

The part number is: 006 545 42 24

To replace, you need to:

-remove the two electrical connectors
-remove the thermostat housing (three 10mm bolts)
-lift the spark plug wire holder up and away from the area
-use a 22mm wrench.

Be sure to replace the crush washer under the sensor, it usually comes with it.

Fastlane, this site, has them listed for $28.20 under the part number:

G5045-12324

Rated at 100/110 degrees C

Engine Temp. Sensor by Behr

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)