Quote:
Originally Posted by JFP in PA
the pre cat is closer to the engine and smaller, so it gets hot really quick on a cold start, lowering starting emissions.
Once the main or three way cat is hot, it has much greater conversion capacity than the pre cat, so it is the only one monitored.
Removing the main cat will lead to problems in two areas: The car will code as the O2 sensors have nothing to go on. With your CARB inspections, the cats have to physically be there, they actually look.
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Just redid my homework, and I think I made a mistake. Haven't been down under the car for a while, but looking at the diagram from ********************************************, there are actually three O2 sensors for both the starter cat and the main cat on each bank, correct?