Thanks MB Doc. Does it point to the/a cause of the P0411, secondary air injection failure, if the diagnostic (i.e., not initial) activations of the air injection pump seem to run for only <3 seconds and stopping very abruptly? Is there impending failure on some part, as this doesn't happen every time. I've gone 6 days without the CEL re-lighting but expect that once enough faults accumulate it will come up.