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Catalytic converter or oxygen sensor?
My 97" Geo Metro "service engine soon" light has been on intermittently for about six months. The code says something like catalytic efficiency out of range. Is replacing the cat a reasonable diy project. Should I try replacing the oxygen sensors first, or at the same time as the cat?
The light has been out for about a week now. So I'm confused if the problem is indeed the cat or maybe the o2 sensors. My mileage has gone down from the 50's to the mid-40's per gallon. Any suggestions would be appreciated.
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