Swapping the stock CAT for aftermarket?

Discussion in 'Gen 2 Prius Main Forum' started by Jimbolimbo, Oct 4, 2020.

  1. edthefox5

    edthefox5 Senior Member

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    Sure they are car will throw a code if emissions are not met.
     
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  2. TMR-JWAP

    TMR-JWAP Senior Member

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    Oh, a wise guy, eh? (should be spoken with Moe's voice....:))
     
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  3. lexidium

    lexidium Member

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  4. Isaac Zachary

    Isaac Zachary Active Member

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    That's not entirely true.

    The car relies on the O2 sensors to indicate if the catalytic converters are burning up HC emissions efficiently creating low oxygen levels after the cats. So no codes means it's burning up HC and likely CO emissions.

    But what about NOx? For those emissions the car just assumes that cat is built to reduce NOx just as well as it can burn off HC and CO emissions. Therefore it is technically possible for a catalytic converter to not be reducing NOX into N2 and O2 and still get no codes.

    Unless you do an actual side by side emissions test you don't know what the actual emissions are or if they are the same with both cats. All you know from not having codes is that the O2 sensors indicate that varying amounts of oxygen is entering the catalytic converter but the other end has a steady low level of oxygen.

    If all I cared about was getting low HC and CO emissions but didn't care about NOx I'd still be driving my VW diesel. The VW would have also been the cheaper route for me than either of my hybrids.
     
  5. edthefox5

    edthefox5 Senior Member

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    My oem cat on ebay sold today for $1350. 487 views and 45 watchers. Now constant emails asking if I have any more cats. People are desperate.
    Guy who bought it lives is Mass.
     
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  6. Isaac Zachary

    Isaac Zachary Active Member

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    So you can make money by selling your old cat and throwing in an aftermarket one (or a straight pipe). I'm surprised it went for so much seeing how you can get a brand new one from a dealer for only $300 more, at least at the dealer I checked with in Denver.

    I'm still unconvinced that an aftermarket cat that's a tenth the price of an OEM cat is the same quality and does just as good of a job at controlling emissions. But that's from my own experience with aftermarket stuff always seeming to be such terrible quality.

    I've gotten into the routine on some of my cars of buying an aftermarket part, say CV axle for example, keep the receipt, and by every 11 months the boots are shot and CV joint balls are falling out and I just take it in and get a free waranty replacment, put that on, wait 10-11 months, rinse and repeat. Same with door handles, alternators, batteries, wheel hubs, you name it. Maybe I'll get one of those Doorman HV batteries so I can have a guaranteed free path to eternal HV battery replacement while I'm at it.

    Do let us know how it's running years from now. If someone has an aftermarket cat that's gone for at least the standard 160,000 miles without throwing a code and continues to pass NOx emissions then I'll believe it.
     
  7. edthefox5

    edthefox5 Senior Member

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    Really don't care what you believe.
     
  8. Data Daedalus

    Data Daedalus Senior Member

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    Holy Macaroni............You’re right!
    I stand corrected . I absolutely had no idea that Hybrids WERE exempt in the UK......
    Yikes...!!!
    Thanks for the link.....


    Source: iPhone 12 Pro Max 512GB ? Pro
     
  9. Data Daedalus

    Data Daedalus Senior Member

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    If mine lasts 5 years before needing replacing, it’s a win win for me. £150 is a small price to pay every 5 years for a replacement catalytic converter in a 12+ year old Gen 2 Prius.
    And the peace of mind is priceless - knowing your cat will still be there when you return to your vehicle.


    Source: iPhone 12 Pro Max 512GB ? Pro
     
  10. Isaac Zachary

    Isaac Zachary Active Member

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    The reason I throw this out there is because my catalytic converter needs to be replaced. And although I could just keep driving it as is, or even throw on a strait pipe (since there's no emissions tests here) the whole reason I've gotten into hybrids is to get better emissions. Sure, any working cat is better than no cat. But how can I be sure an aftermarket cat will clean up emissions just as good as an OEM? Are there any emission test results that can be compared between the two? Are NOx emissions actually the same between both?

    If I was just into saving money and keeping cat thieves out from under my car and doing whatever to get by with ok emissions there are plenty of other cheaper options out there than a 15 year old Prius.
     
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