Hi S 94 S4 avant 6 speed. "ABS Aus" light is on and I now notice the diff lock won't engage. No other issues or symptoms that I can detect. Shower me with your collective wisdom please. Sam Clarkson Edge to Edge P.O. Box 27 National Park 2653 Ph 0800 800 SKI (754) http://www.edgetoedge.co.nz