I've never seen an O2 heater code on my '01 (not sure if it even HAS heated O2 sensors), either. Last time I got it inspected, I was able to get all the emission monitors to set, except for EVAP. Having one monitor not set is OK for my year model in Texas, though. It only took me a 5 mile drive (not following any "drive cycle" regimen) to get the others to set.

On the other hand, a few years ago, it took me almost 500 miles of driving to get my '04 Chevy 2500HD (6L gas) to set the monitors. Even after I closely followed the prescribed "GM Drive Cycle" at least 10 times. I drove it several days, with many key on/off cycles, but with no luck. Finally, all but the EVAP monitor set. I had replaced one downstream O2 sensor, and the evap filter, prior to that episode.

On other cars & trucks, resetting the emissions monitors has usually taken about 50 miles doing the GM drive cycle, after repairs and code clearing (most of my vehicles have been GM). The quick reset of the monitors in the X5 was a pleasant surprise. Can't wait to see what my wife's Lexus will do, when/if I need to reset the monitors.

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01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"

Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E

Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide