SRS LIGHT IS ON ALL THE TIME ON MY 2001 MERCEDES E320.. HOW CAN YOU FIX THIS

It's probably something that requires professional diagnostic testing and repairs. The light coming in is an indication of a failure of some sort in the supplemental restraint system -- which is comprised of air bags, seat belt pretensioners and other safety restraint sensors, wiring and devices. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops