Need some help. My check engine light is on, and the temp guage keeps dropping in and out. My mecanic replaced the Harness from the engine head temp sensor to the PCM and the sensor. He said it should read 1.6 volts cold, and its reading 5.16 volts. He said he has done all he can because Ford will not give him the info he needs to check the PCM , or something like that.or Flash it. I don't know alot about this stuff need help. Thanks

 

Maybe take it to Ford? If he's done all he's could, then thats that.