Check-Engine lite on: Code returned P4011: "secondary air injection flow at wrong rate".

I had a check-engine light on, and people here suggested that I get the problem code read from the car's ecu as soon as possible.

So I went to my trusty mechanic who said that his computer can give a "general industry standard reading" of the code, but that it might take Audi to get something more specific.

Here's what came back:

Code: P4011, "secondary air inj flow at wrong rate".

He said that this is not a drop-dead critical error. So he said to try this: He turned /OFF/ the engine lite via the computer interface (nullified the error code) and said that if it comes back in the next day or so, then it's still there as an issue.

Is that really a good idea?

Does clearing the error code (and thereby turning off the check-engine lite) allow the code to come back if still a problem, or does this PERMANENTLY stomp on the error???

TIA