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2000, 421, baro, cat, caterpillar, check, clogged, code, engine, ford, ho2, mazda, protege, protege5, sensor, test

code 421 - clogged cat? sensor?

MiltonOS on Nov 1, 2005

Feb 19, 2006 10:51 AM
by Mazdacub

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3rd gen Engine/Drivetrain

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