Remove the dash and replace the evaporator...you might as well replace the heater core while your in there. Its a big job...but can be done a lot cheaper than bringing it to a mechanic
You can remove it and clean the filter inside it or you can replace it.
It means you have an Evap purge control leak in the EVAP system. Basically when you have gasoline in a car there are a lot of excess fumes, these fumes are routed through the EVAP system of the car, through a charcoal canister, and returned back to your gas tank as liquid fuel. A leaking charcoal canister, Evap Purge solenoid, PCV lines or PCV elbows can cause this. Also a leaking gas cap can cause this. I would recommend replacing the gas cap first. if that does not do it, check all the connections to the EVAP canister *located in the engine by the firewall*. If there are any leaks, change the elbows or lines. IF the problem still exists you most likely need a new charcoal canister or Canister purge valve solenoid.
The evap canister.
The EVAP purge solenoid on a 2001 Nissan Sentra GXE is under the hood. It is mounted to the top of the intake manifold.
Evap Canisters on all gm vehicles are not servicable from 1990-2009 year
In the 2001 Toyota Corolla the evap purge solenoid valve is located near the underside of the air cleaner. This is an emissions control device.
evap vacuum cut valve bypass valve
Evap Leak
You have a problem with the EVAP system. Could be as simple as a loose or bad gas cap.
i think about every s10 blazer has had this problem,lol this is very common. Usaull problems are evap canister or tank vent port leaking, your computer can detect 1\16 of an inch of a leak, The cheapest thing is to check your gascap for a leak, if you let your vehicle run with the gas cap off, like getting gas for example that could have set that code off.
any where
180 foot pounds