I've got this code coming up right now. Had an injector go out on my 2011 S5, failed open and caused major problems immediately. I Had all fuel injectors replaced and had the intake manifold cleaned for carbon build-up while everything was off the car . Car ran well for a couple days before the check engine light came on (about 100miles). Stopped on way home to get gas and the cap was loose. Re-tightened and the light went off. Two days later, same thing (I do have another one ordered just to rule this out). Could this cause this code? Car seems to be idling a little rough but it might be psychological at this point. Don't really see any power loss but the car has an APR Stage III and I rarely push it. Any ideas? Checked for obvious hose leaks and check valve but all looks good. I have read that the MAF sensor could cause this as well as O2 sensors but I am not throwing any other codes. If it matters, the car has 48,500 miles...
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