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code P0420

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16K views 5 replies 5 participants last post by  SUBARUADVISOR  
#1 ·
hey i got the code P0420 yesterday. i have a grimmspeed gesi downpipe, and i know thats the issue, im just curious if its fine to drive with the code cleared for a couple weeks until it gets pro tuned which i hope will solve the problem
 
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