My 99 Blazer, 4X4 has failed inspection due to the SES light being on. I have three codes:

410- Secondary Air Injection System Malfunction
440- Evaporative Emission Control System Malfunction
452- Evaporative Emission Control System Pressure Sensor Low Input

So far, I have replaced the no working AIR pump, replaced the 2 AIR check valves and the gas cap.

My state (Delaware) will fail the car for the SES light being on. That being said, I am on a wild goose chase to determine what is wrong with this thing. The car runs fine, outside horrible gas mileage.

Thanks in advance.

 

Have you worked through the diagnostic steps for these codes?

P0410 Explained

P0440 Explained

P0452 Explained

 

I recall when I did the last fuel pump on this car, the vent hose fitting on the top front of the tank split. I glued, but now thinking that could be causing one of the issues if it has an air leak.

 

Secondary air injector is mounted under the radiator on the drivers side. When mine went bad it was under warranty and the dealer installed a new one but also remounted the harness and added a "snorkle" with a small vent filter all the way up to the battery this helps keep rain water and road grime out of te air injector preventing future premature failure