Mazda protege 5 2003. P0090. H

Question

I believe it is causing a p0421 with what can I do to fix it

Answer 1

Hi there,

This code points to an issue with the catalytic converter. Here is some info for you.

P0421 MAZDA - Warm Up Catalyst System Right Efficiency Below Threshold

Read more: https://www.autocodes.com/p0421_mazda.html