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I too am having similar issues at the moment, with a suspect battery/alternator , after replacing the front two air suspension struts & bags, in the cold 0°C to -2°C mornings, and turning the defrost cycle on, I am now daily or more getting the:
• HDC Inactive;
• Air Sysp. Inactive (double lights on console);
• DSC Inactive;
• ABS light on dash;
• Brake light on dash; and
Air remains in the air-bags.
Key off-on-off cycle to reset, and when ever a strong braking occurs, or a large drain electrical appliance is used, they ping on again.
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Maxintosh that sounds like a battery on the way out or a bad connection, check battery terminals for corrosion plus check for a bad earth on the frame there could be corrosion there too.
Deco.
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Maxintosh mine has same issues but it is steering angle sensor that is the problem.Hav'nt checked battery.