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So my girlfriend just bought a 2002 Miata and everythings fine with it except the check engine light came on the other day. We got the code read and it pulled up a P0421. This is a either a faulty cat or fouled 02 Sensor right?

How much you think we could get an aftermarket cat put on for, as I'm sure that'd be cheaper than the stock Mazda one from a dealer. Or should we go with replacing the 02 sensor first?

Thanks for the help.
 

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A bad sensor should give a different code. I would get an aftermarket one welded in.
 
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