1996 Audi Cabrio has engine light on - code is 0116 - ECT problem (Engine Coolant Temp). I had this before, and got my fluids flushed, the engine light went off.Recently, Ihad my spark plugs changed and thelight went back on.I think it's a loose connection with the sensor wiring, since the fan works fine.Can I fix this myself? Thanks for your help.