I have an 2012 Audi A4 and the check engine light came on. The engine is also shaking and has a rough idle. What could be the problem?
You have provided limited information, so It's not easy to point out what the real problem would be.
It could have been a simple problem, but when you mention the Engine shaking, it seems like it might be a far bigger problem that needs to be sorted out. It might be an issue with the ignition coil, as the above comment guides, I don't personally think its a spark plug issue.
I hope you have solved this problem by now but that's usually a bad: