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I have the same car, and experienced the same ABS pump behavior today, but it corrected itself.
After restarting the car at a gas station, the ABS and ASR lights suddenly illuminated. Drove 30 miles, turned car off, restarted, and lights came on again. Turned car off and planned to do some research on MercedesShop, when I heard humming from the engine bay. Opened the hood, and the ABS was running -- with the car turned off.
I drove to my mechanic and, of course, when I got there the car behaved normally -- no lights, no humming pump, and ABS/ASR behaving normally.
Only notable difference when the problem occurred was the A/C and radio switches were in the "on" position, which is something I rarely do. Could starting the car with a heavier than normal electrical load cause a hiccup (i.e. in the the OVP) which caused this odd behavior? Or is it an early warning that a relay, or perhaps even the ABS pump, will soon fail?
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2008 E350 4matic / Black/Anthracite
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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
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