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I've put the one fault reader on the car and it comes up P0304 cylinder 4 Misfire, I know all the things it could be. But has anyone else had this problem with a common remedy
 

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What engine? Swap the coils over and see if the miss fire moves. That shows its the coil. If it doesn't move then it might a plug. Or the mulitair unit but I'll need to guess what that car you have....
 

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That also assumes the code reader works on the MiTo ... plenty don't properly.
 
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