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After failing emissions test for high CO and NoX, I added an air/oil separator to my Toyota MR2 with success. I first tuned it, plugs, wires, air filter oil change, it failed. Ran codes that pointed toward bad O2 sensor. New O2 sensors, failed. Borrowed a known good cat, still failed. I had been burning some oil for quite a while, but I didn't want to rebuild it at that time. I put my old cat back on, added a CARB legal high flow PCV valve and ginned up an air/oil separator with parts from Harbor Freight, passed. The car gets better mpg and runs on 87 octane again, as well. Still needs a rebuild, the 2000-2003 MR2's were known for their oil control rings wearing out prematurely, but I bought myself some time.
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