1997 Mazda MX-5 Miata: Pulling the Codes
April 30, 2013
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