I had ZEX 55 shot installed today and the first time i spray the check engine light is on and stay on! What is wrong? I double check all the wire and hoses and they are all find. Does anyone know what is going on? thanks

 

scan the car and see what the DTC is. Could be a short to ground on the TPS wire depending on where you grounded the ZEX system. I don't know anything about ZEX, I run NOS. I didn't want a nitrous system tapping the ECU. I like mechanical switches.