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Does anyone know of a good site that explains the whereabouts of both (or just one of each) the O2 Sensor and the EGR Flow Valve? Not just location, but how to clean and replace, etc. I can do most of it if I could just find out where the heck these two parts are. I noticed that there's a Sensor located in front manifold exhaust pipe before catalyst and also a Downstream sensor, after catalyst. Should i replace one or both?
Anyway, I might be coming back and forth to this topic until I get these things resolved.
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