If the ABS light is on and your ABS is functional -- It's the OVP. I've never heard of the light come on for any other reason. I had it on for BOTH of my w124's I own. 300TE required a brand new OVP, 260E just needed a new fuse for it.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k