ok got a new one from the dealer when i put it on 1st time i installed it without a washer didnt know just wanted to do it quick (lazy) gear got stuck so i go back put the old washer on with new switch worked. 5min later im driving engine light comes on ran it on a scanner at work same code. not a tech but i know how to do basic things on a car work with 1 tech but he sucks i dont trust him. anyways the old switch had like a lil bit bigger ball at the top of the switch new one was a lil smaller. and can that washer make a difference?(dunno)