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CatB1 NOK + P0420

jpadie
in Skoda Fabia Mk1 (1999-2007)

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Hi all
the little skoda failed its MOT by the skin of its teeth. excess CO.
I replaced the pre-cat lambda probe (had to grind it off and get a socket on it directly as none of lambda sockets slipped and the crows-foot snapped).
no improvement in diagnostic readings and a test of channel 46 results in CATB1 NOK and P0420.

Is this a new mani-cat situation? I can't see any cracks.

thanks
Justin

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