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Old 01-28-2017, 06:54 PM
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upallnight upallnight is offline
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Join Date: Aug 2012
Location: Cook County
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Either your cats needs to be replaced or you need to replace both post cat 02 sensors. The graph for a post car 02 sensor should be almost a horizontal lines once the engine is in close loop. The graph that you show have the post cat 02 sensors bouncing up and down.



Here's a link to Scannerdanner video on determining a bad cat with the use of the 02 sensors pre and post cat.

https://www.youtube.com/watch?v=vyVnhCIMDnw
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Last edited by upallnight; 01-28-2017 at 08:07 PM.
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