I have been getting a couple codes on my blazer, code p0440, which is the air-smog pump, generally I clear the code and it goes away for a couple weeks or so then it will come back, right now that code isn't there, any suggestions, replace or just clean it up and see if any water in the pump, where is it located? I was told up front by the oil filter on passenger side, does this make sense.

Also, just today, got a p0446 code for the first time, evap code, vent control malfunction. Where should I start with this one? Is it something to do with the vent for the gas system under the truck by the tank? All you help is greatly appreciated, as always.

2001 Blazer, 4dr, 4x4

 

I just used 'Search' for 'P0446' and voila!
P0446 EXPLAINED

The air pump is under the bumper on the right hand side.