i have a 01 s10 exterm and the service engine light came on and it says p0446.

Check other answer. But deffinately take it to someone you trust to locate the problem and save you from a headache. Goodluck

it is meant for canister vent it normally above the transmission, or the purge solenoid on the engine it has a hose plug to the purge solenoid and a wire plug on the on top.