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Warm Up Catalytic Converter Efficiency Below Threshold

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Old 05-04-2023, 02:36 PM
Truwarrior22's Avatar
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Originally Posted by MalcNZ
Ouch, so if I read it right. You have had to replace the Cat on the header manifold. So on my V6 I am possibly up for 2 cats (1 per cylinder bank) and then possibly the main cat as well. That will work out at major dollars as here in NZ the only choice is Genuine from Mitsi or import generics from overseas which will include extra freight costs.
I had code 421. I guess that’s the warm up catalytic converter, ie manifold. Appears no one actually had a clogged catalytic converter yet. Mine check engine light would just go on and off intermittently without any performance issues. If you have emissions testing, a bottle of cataclean may help but likely temporarily.
 
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