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3rd Gen Protege/MazdaSpeed/P5/MP3 General/Maintenance Discussion for 1999-2003.5 Models Only (BJ Chassis)

i think i have a bad cat

   
Old October-11th-2016, 10:27 PM
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i think i have a bad cat
so i think ive got a bad cat, in TN there are no emission laws/tests. if i straight pipe, can i skip the second 02 sensor and call it a day? or is that going to cause other problems. i just dont want to spend the $$$ on a new cat, im not gonna own this vehicle for more than a few years
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Old October-12th-2016, 02:18 PM
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more info, sorry, its a 2002 protege 5spd with 210k miles on it. i think it was popping code p0421
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