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First timer. Just bought 2002 A4 3.0L Got Code P0431 (warmup catalyst below threshold ?) and shadetree mechanic said I need new Catalytic converter. But I hear there is more than one coverter. Where are they at? Help
 

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Welcome to the forum, the cats(twin)are situated in the exhaust run somewhere between the manifold and the back boxes. They are not cheap and will set you back some money though :)
 
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