Quote:
Originally Posted by Dzmitry
Trying to dig this information up, I thought I recall this being discussed in the past. But based on what I described, it doesn't sound counterintuitive to me. The rear cat does the big work once the car is warmed up. The front cat is there to assist emissions during cold start as it warms up the quickest. I'll see if I can find where I heard or read this, it's possible I got it wrong. I'm sure someone on the forum knows the answer to this.
EDIT: To add to this, the rear cat is quite a bit larger in size, likely definitely having more cells. Also, tons of people have confirmed that if you remove the rear cat, you will have a smell compared to removing the front cat.
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I just don’t see how if the secondary cat does the majority of the work, why it wouldn’t be called the primary cat? Also why would there be 0 sensors on the secondary cat? Seems like you’d want a measurement post secondary cat if it was what really cleaned things up, instead of just post primary cat.
I’d be curious to see where you read this stuff as I could easily be wrong too. Just want to learn more about this stuff.