I have posted about this over on Bimmerboard as well. I have been getting an intermittent SES light. If I drive my car below 50/55 all day no freeway driveing the light will go out. IF I drive over that the light will come on the next time I start the car after it sitting for awhile.?????

I went to Auto zone and only one code came up: P1461

Which So far the definition is (HEATED CATALYST LOW VOLTAGE)

Also to note my car is a 750IL with e-Cats

So far it has been suggested it was my batteries however I had both batteries replaced last June.

Also the O2 sensors have been mentioned as well

I am hoping to get a clearer picture somehow to rectify this problem with out just replaceing a bunch of parts hoping to get the right one.

Thanks