Hey guy i need help,I washed my motor yesterday as soon as i finish the MPH gauge stared to go up and down and speedometer is moving without me steping on the gas. please help. My friend told me it was the sensor but we don't know wich one is it, can someone take a picture of the sensor, thank you!

 

Is your car a manual trany or auto? What year is it? Does the speedo move up an down while you are driving? It could be either a speed sensor, which is located at the transmission, or a bad speedometer. Does your car have cruse control? If it does, does the cruse control work properly while the speedo moves up and down? If the cruse works fine, but the speedo moves up and down, than you might have a speedometer issue. If the cruse also malfunctions, than it is the speed sensor. I think the speed sensor is a lot cheaper than the speedo.

 

The car is working fine now I guess something got wet but now that is dry is working just fine thank you anyways.