Catalyst system efficiency below threshold

Tiny
2CP-ARCHIVES
  • MEMBER
  • 1997 ACURA CL
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
The code indicates catalyst system efficiency below threshold Bank (1) any idea on how to correct?
Thursday, October 7th, 2010 AT 6:10 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
More than likely this issue is due to a failed converter, but we need to run through some testing to confirm this because there is a chance that you have an o2 sensor issue.

Here is a video that will help with doing this testing and replace the converter if it proves to be the issue:

https://youtu.be/kNXh1Lphzr4

This video is on a different vehicle, but it is going to be similar:

https://youtu.be/1Hh12_mWw8k

I am attaching the process from the manual on how to replace this as well.

Please run through this info and let us know what questions you have on this.

Thanks
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Saturday, March 26th, 2022 AT 6:24 PM

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