how to repair the SRS light on a 1990 Mercedes Benz 190 E Class
The SRS light is controlled by a ring of contact sensors on the column behind the steering wheel. Your mechanic will remove the airbag and check to see if duct and debris is causing the issue. Usually they replace the ring. Sometimes you can fix the issue by spraying with compressed air between the wheel and the column; since your car is 25 years old, this may not work.
What does SRS mean
Search Mercedes-Benz 190-Class Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Mercedes-Benz 190-Class Experts