99 1.8 protege ES (auto)

Has anyone changed the oil sensor before? (last time my car was in the shop the mechanic told me that it was leaking oil and may need to be replaced over time) I've recently done an oil change and found that it was leaking...so I unpluged it and wiped it and plugged it back in but it's still leaking so i may have to replace it. I'm looking for any helpful responses to help me fix this problem.