Here is some 02 info:
\\ https://sites.google.com/site/mikefocke2/oxygensensors
You have removed the main cat and it may be that the secondary cats just are not up to the job of getting the numbers right. We did just the opposite, and removed the secondary cats and the pipes had a bung for the 02 sensors. All works well and the Durametric shows all normal operation and readings.
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Jon
1966 912, 1976 911
1986 944, 2000 Boxster
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