P0421 Code Help?

revomatic

Member
:
02 Mazda protege5
I have a 2002 protege5 wagon & my light came on do to a p0421 code. Should I just replace the cat. Or is there something else I should do. This is my First Mazda & everything is new to me. I also had a p1250 code but I found that's an easy fix? Does that relate to the 0421 code by any chance?

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I've seen that video it's an easy fix. Just want to fix that other code & keep the car stock as possible with no short cuts here in NJ we have inspection & the do a visual look at the cats


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