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Catalytic converter performing below threshold?

Tiny
RORYLOTZ
  • MEMBER
  • 2005 HONDA ACCORD
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 216,738 MILES
My car has had its check engine light on for the catalytic converter performing below threshold. The car has two exhausts and the exhaust on the right side of the car is performing just fine, since it’s been cold out, I can see the right-side exhaust is emitting exhaust while the left side just isn’t putting out as much. I’m thinking the left side exhaust has something clogged in it somewhere and that is why it is performing below threshold. Do you think this could be the case or is it something more than that?
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Sunday, March 5th, 2023 AT 1:50 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,351 POSTS
It does sound like the left side could be clogged but keep in mind that the steam you see can be because of the condensation and the right side could have built up more which causes the steam, to tell for sure let's use this guide below which will tell you be the temperature which is a true test.

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Here is how to change the catalytic converter out in case you need it in the images below. Please let us know what you find.

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Monday, March 6th, 2023 AT 8:54 AM

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