1997 Mazda MX-5 Miata Long-Term Road Test

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1997 Mazda MX-5 Miata: Pulling the Codes

April 30, 2013

1997 Mazda MX-5 Miata

Project Miata's check engine light is on. This is the code that came up: P0420.

P0420 is a catalyst efficiency code. This could mean that our cat's not functioning properly, or an oxygen sensor is on the fritz or even something else.

But I suspect the cat. Project Miata has gradually been feeling slower lately and running sorta grumpily. All of those things point to a toasted cat. I'll check that first.

Jason Kavanagh, Engineering Editor

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