Is the EGR valve cleanable?
Yes you can clean it. Remove it and spray it with carburetor cleaner and clean the tubes out with a small screwdriver.
Is any programming or additional adjustments needed after a new egr valve is installed in a 2000 Toyota Camry 4 cylinder?
Secondary air system - a more geeky term for the Exhaust Gases being Recirculated back into the air intake, better known as the EGR system. The "Related Questions" below will get you started on your EGR education - hopefully avoiding a needless replacement of a perfectly good, or 'cleanable' EGR valve (been there done that).
* Remove the air intake duct from the throttle body and air filter housing * Position the hoses and wiring harness aside to access the EGR valve * Disconnect the EGR pipe * Remove the EGR valve mounting fasteners * Remove the EGR valve and gasket from the manifold.Discard the gasket * Using a gasket scraper clean the EGR valve mounting surface