Reply To: Nissan Quest – 2004 – Code P0306 – Location of Cylinder 6

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#6723

Oldman
Participant

Checking the coil itself is not a straightforward thing to do. You have to have a pretty sophisticated analyzer tool to do that. The easier thing to do is take the plug out and put a plug tester that lights up when you turn the engine on. But even then you may have a hard time telling whether the firing is normal or not. You need to be able to tell if there is any difference in firing patterns between cyl 6 and the others. If you can, the problem is electrical. It could be anything like an internally broken wire to the ecu itself. If not, then just concentrate on the mechanical tests in my previous post.