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Error Code P0420

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Old Jan 25, 2014 | 01:24 PM
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Koru_Kinshi's Avatar
Koru_Kinshi
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From: California
2018 E63S AMG, 2003 SLK 230 Sport, 2004 SL 600, 2006 SLK 55 AMG, 1998 E320 Wagon
Error Code P0420
So my '02 C230 Sportcoupe just popped up with a CEL.

Error code P0420

Anyone have an idea on what it could mean? I've got MBH Headers, ECU tune, and a crank pulley. Nothing serious, though.
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Old Jan 27, 2014 | 04:41 AM
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mohd.awaly's Avatar
mohd.awaly
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From: lebanon
mazda mx5
p 0420 --- catalytic converter system , bank 1 - efficiency below threshold

a clogged catalytic converter or an busted o2 sensor might cause this fault ... but its more probably the converter ...
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