Code 11? Momentary interruption of ECU power... So, unreliable ECU... Uh, it might.
There are a hundred factors which may cause you to fail. Without knowing specifically how it has failed (what the measured levels were) you'd really just have to make sure the car was completely bone stock and everything in near new condition to get anyone to assure that it would be just fine (even then it's only going to be 99%, always room for something to go wrong).
With the 57 trim some areas may be a little leaner than stock which may bring up the NOx a fraction, nothing I'd worry about as long as the EGR system is in good shape.
Now the code 11 could indeed cause issues. Especially if a hiccup occurs during the test. Even if it doesn't fail the sniffer test they may fail it for a check light during inspection.
But, you really won't know until you take it in. I strongly recommend you get that code 11 fixed though.
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