If your car fails emissions, the testing facility should give you a reason why. This will be your first indicator pointing you in the right direction.
Also, when was your last tune up? This in itself could fix your problems. If you've already done a tune up, then a more thorough diagnosis is in order. Have your tech check the EGR valve, Cat efficiency, O2 sensors.
Also, keep in mind that your engine has 200K miles on it. No engine last forever, and when they begin to wear significantly, they produce more emissions, and will eventually need replacing/overhaul/rebuild.
Monday, December 27th, 2010 AT 9:39 PM