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Just want to make sure we're talking about the same things. You were saying the starter/pre cat gets hot quicker because it's closer to the engine, and once the main cat (closer to muffler) gets hot, it'll convert more than the starter cat. But isn't the pre cat monitored by the computer with two sensors? There isn't another O2 sensor after the main (2nd) cat to monitor its performance, so how does the computer know it's there?
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