Anyone have any experience with a sc petrol and the P0420 & P0430 engine codes?

Mine seem to come on every 2-300 miles.

Don’t know if it can be the cats or O2 sensors.....

If Cats does anyone know where a reasonable priced replacement might be or an alternative work around even?

Thanks. 2005 (55) Range Rover 4.2 Supercharged Vogue SE Java Black

It's usually the sensors failing that give that code, get them changed, they are much cheaper than new cats...

You can get the cats checked at any MOT garage...  Pete
I now have permission from the boss to use Y.O.L.O. Enjoy life
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2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand Sold
2002 L322 Vogue 4.4 V8 Epson Green (Fatty Offroader) Sold
-Click for Project Fatty off roader-

I have one brand new one (front sensor, denso) £50 if you want it... I accidentally bought 3 ... don’t ask 😂 Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF