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It can also be a bad O2 sensor, the post cat one. Even if it isn't the O2 sensor you may be able to keep it going and pass inspection for a while by changing your driving style. Don't tool around at low revs, but let the engine sing and drive in a lively style. I have a dying cat that I have kept going for 2 years now by doing this. I do have a replacement manifold/cat sitting on a shelf, ready to go in if the light comes on hard or I need to pass inspection.
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2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
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