Having problems with your 2002 Mazda Millenia ?
(2002 Mazda millenia) I was told by Pep Boy these diagnostic codes: p0421 warm up cat efficiency bank 1 and p1170 b1s1 o2 sensor inversion fault. What do they mean and how should I address them?
Repair Help & Product Troubleshooting for 2002 Mazda Millenia
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