How much does it cost to replace the windshield washer fluid sensor/container?

What is your question?

My indicator light came on the dash. The fluid was ok so I took it to my mechanic who told me that it was the coolant indicator.I was told the sensor was in the overflow container. I paid $45 for the part and 45 for the labor. The light was still on so I was advised to take it to the dealer who told me it was the washer fluid sensor, so they have ordered the windshield washer container which has the sensor attached. They said they would drop the $95 diagnostic charge and it would cost me $145 to replace this part. I really have been through hell for this. Am I being ripped off again?