31,000 miles later, BAM, ABS inop.
Near 100% chance this is a wheel speed sensor which is supposed to be a common issue on the W221.
So I'll put this here. I will scan next opportunity.
https://www.fcpeuro.com/Mercedes~Benz-p ... ic&b=Sedan
I would price out Mercedes but these are affordable.
07 S550: ABS light on
07 S550: ABS light on
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Re: 07 S550: ABS light on
That thing I said. I guess it's one of the rears. Could just do both.
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Re: 07 S550: ABS light on
It hasn't happened again. Would be nice to catch it in the act but I may still just do both rear wheel speed sensors at next oil change.
Re: 07 S550: ABS light on
Haven't been driving it a ton but still has not recurred. It is due for an oil change so I have to decide if I want to preventatively replace that wheel speed sensor or let it fail for real.