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I found an older OBD II data logging program that'd talk to my cheap gizmo. It'll only work with COM 1 or 2, no problem to change it.
Logged a bunch of data from the four O2 sensors then used the Excel 2003 chart wizard to make line graphs.
Both bank 2 sensors show their voltage going up and down fairly evenly, same for sensor 1 on bank 1. Sensor 2 on bank 1 is acting different, not varying as much and hovering near the bottom of the range with some higher spikes.
It keeps setting the code for bank 2 cat efficiency below threshold.
Somewhere I can post the excel file for people to look at? Need more data logged/from other sensors?
I'm hoping there's something wrong with it other than a bad cat. There are four cats and they're all welded into the pipes.
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