Should have 2 lambda sensors. One in the header and one at the bottom of the downpipe.
The ECU measures the reading between both. The 2nd one would detect and flag a CAT Efficiency error if there was no cat.
Therefore I would expect yours to log a Cat efficency error if it is mounted pre-cat.
If it isn't, then either :
you have a lambda in the bottom of the downpipe
Or
you have one in the header and one in the top of the downpipe and the remap has deleted/disabled that code
As mentioned above the correct configuration is a one in the header (pseudo wide band) and one in the bottom of the downpipe (which I beleive is a regular narrowband).
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