Not the valves.
Not the air pump.
Not the cat.
You have a bad front o2 sensor right out of the box, a bad wire or conection to that sensor, or a bad ECU.
Your 5 flashes are for a failure of the 02 heater circuit in the front sensor.

There is NOTHING else it can be. Thats it!

 

I would check your wire continuity all the way back to the ecu. If you want your car fixed, you will do just that.

 

Thanks boys i have à bad ECU

 

Look around on the net. I found a very low miles ecu when mine kept throwing a CEL for the po411 code for only 75$