For the P200A code, you could remove the EGR tube and look inside your intake manifold with a flashlight (or a borescope) to see how much carbon you're dealing with. To get to the EGR tube, take off the decorative engine cover, disconnect the intake muffler from the air filter housing, and it's right there on top. 2x 8mm bolts on one end, and 2x 10mm bolts on the other. "While you're in there", clean the tube, Temp sensor, and the MAP sensor. Both sensors are on the top back of the manifold and have one bolt holding them in - Torx, I believe.