i also have no spark, and the car doesnt start, it will crank but wont actually start up,i did check fuel pump relay (relay # 372) i put it into my A6 wich has exactly the same one, and the car ran fine, so the fuel pump relay must be fine, for some reason stillgives a code, guys i need some help, because dont know wat be causing, after i i put in new engine speed sensor, please help thanks

 

You need access to a wiring diagram to figure out which fuse/relay controls everything on that circuit. You could have left a connector loose or blown a fuse on accident. I won't know what controls everything without a diagram.

 

where would i get a digram, i got 2 diragrams of the ground terminals through out the car, the dealer gave it to me, i ll check wat happens

 

You have to buy a bentley manual for the car. The dealer isn't supposed to give you wiring diagrams, so don't expect them to give you any more. This issue might be over you head, you may want the dealer to take over for you.

 

But what would go wrong between me replacing the radiator,i only unhooked the headlights and took them out, also taken the bumper support of and bumper, thats all just to replace the bumper, the car started before that, i m going crazy with this thing,

 

there is little bit of water in the box case thing that has the ecu and stuff, but its only at the button of the box, also the fuses are good there, there is also a relay # 53, dont know wat its for, but it smells like something is burned, any ideas???

 

Maybe try replacing that relay?

 

what is that relay for though???

 

hey guys looked around the ECU area, there is water over there, like the water is below the computer and but like on the buttom of the box where the computer is and like all those fuses and wires, there probbaly 1 incho or so of water, will that cause something fishy like that??? and also some fuses read 12 volts and some read only about 4 like the fuel pump fuse

 

Well the ECM box is supposed to be sealed, so if water is in there you could have fried your ECM. My central locking module just went out because water got in there and i had to replace it. Check the fuses and relays in the ECM box before condeming the ECM.