MX-5 Owners Club Forum

Engine running issues

Technical Area Engine, Transmission, Exhaust etc

Scottishfiver 14 March 2021 14:23 4

P0421 code Engine, Transmission, Exhaust etc

Hi all on my 2005 MX5 mk3 NC 2.0, the EML came on Yesterday I plugged a scanner in which threw up this code P0421 . Anyone else seen similar? I kmow it’s related to the senors before and after the cat . Is it likely to be the cat or sensors? if a sensor, which one is likely? or is there anything else I need to check?

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