Had XJ smogged today since I just bought it. Here is the report. NoX looks a little high. O2 sensor or cat? I replaced the airfilter (K&N cold air), plugs, seam foamed it intake, cleaned TB before test.

HC
Max
54
Measured
27
--
CO%
Max
.69
Measured
.07
--
NO
Max
527
Measured
217