> My temp 2 sensor reads approx 2k ohms when cold and 400-500 ohms when hot.
Is this a normal reading or is there something buggy in the sensor?

depends on what you mean by "cold" and "hot" ... the vw info is just a
chart, with a falling ohm-reading as the temperature INcreases.

these are the values of the chart, as best my tired old eyes can read them
...

   Temp                                     Max Ohms     Min Ohms
   0C    32F                                  6400+             4700+
 10C   50F                                   4000+             3200+
  20C  68F                                   2800+             2100+
  30C  86F                                   2000+             1500+
  40C 104F                                  1500-              1000-
  50C 122F                                    900                  700+
  60C 140F                                    650+                520+
  70C 158F                                    500-                 400+
  80C 176F                                    370-                  300-
  90C 194F                                    290-                  220+
100C 212F                                    230+                 180+
+ means that value plus probably a little more. that is, my numbers could be
off
    as much as +/- 50 below 50C/122F, and as much as +/- 20 above 50C/122F
    (the chart has two y-axes for different ohm values, depending on
temperature)
- means that value minus probably a little more. same as + above.

so if your outside temp was say 86F when you tested it, with the engine
cold, then later if the engine coolant got up to around 158F or so, yeah,
those values would/could/should/might be "normal".

trouble is, i've found that the sensors fit the charts, but when i changed
them anyway, the problems with idling went away. so i kinda think maybe the
chart is a bit wrong.

joel