[fmorelli]

jts1981, give me the week to get reasonable miles on the car, and we'll see what happens. Post-cat 02 sensors are simply catalyst efficiency monitors. They are 4-wire, which means they are also heated, so the issue of their not being right on the downpipe is irrelevant. Furthermore, the way these are installed, they receive exhaust gas but are slightly out of the flow which, if anything, improves the efficiency reading. To the last point, an analog with old cars with post-cat 02 sensors where the catalyst is failing, is to screw in "anti-foulers" (an old-school spark plug solution) and then the 02 sensor. This backs the 02 sensor out of the direct exhaust flow and often solves a CEL issue with a less than optimal catalyst. More than you care to know, I'm sure.

But we'll see where we are end of this week.

Filippo