Mazda Forum - Mazda Enthusiast Forums - Why does my P0421 code come and go ?

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zr1mark

Jan 27, 2010 01:16 PM

Why does my P0421 code come and go ?

It seems every couple of months I get this code. I have a code reader and I just clear it.
The front cat and 02 sensor are fairly new so I wonder what it could be ?
Reading up on it, there are so many possibilities....

Thanks
Mark

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