Same here: P0410. Check engine light on and off then on again. Just bought the car. The previous owner had the Secondary Air Injection Pump replaced on 02/05/19. I would take it back to the people who did the replacement but they're about 2 hours away. From what i've read here i'm guessing it's either a bad connection or a bad relay. But i sure would appreciate any input whatsoever. I really do not want to take it to a shop. Thanks in advance.