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your o2 doesnt get cleaned.. it gets badly contaminated by the seafoam. your plugs too. seafoam works, and i believe its pretty good stuff.. but plan on changing your plugs and at least burning your o2 sensor clean. mr2 o2's only last about 30-50k anyway, chances are its a good time to just replace that too.. but still, that unrelated to the NOx problem.
your EGR valve is plugged. its a common problem. you need to remove it and scrape it clean. also clean the manifold holes.
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