Yes, I did replace them because of the code, but more to the point, the poor performance. I am definitely saving the OEM CATs, fully aware that the problem may be something else. I have new A/F and MAF sensors on order. Had already replaced the O2 sensors since they were fairly easy to get to, but problem persisted. Did 2 consecutive treatments with Cataclean, with no effect -- except to my wallet. Picked up these CATS supposedly from Canada at only $168 for the pair, with free shipping. So, I said I'll just give it a shot and maybe either fix it or learn that I need to look for the problem elsewhere. Boy, what a chore, though!

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2009 X5 3.0
2001 X5 4.4 - Sold