Originally Posted by woody
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.
anyway you could give us a DIY to put that resistor in.