Originally Posted by BRappaport
I had the exact same problem...with check engine light and code...it was a bad gasket on the pump...you could actually feel the air coming out of the pump. The pump was replaced at 4,500 miles under warranty. Easy and straight forward ...but they had to order the pump, which took about a week. This is the third occurrence of this that I have seen on this forum.
That's interesting. I am not aware of any part of the OBD that monitors the airflow or pressure in the auxiliary air circuit, just the pump supply current. The only way I managed to trip that code was by electrically disconnecting the pump. With a resistor in place of the pump and the code reset I never get the code appearing. Perhaps the leak significantly affects the pump current drawn by the pump which trips the code.