They put in a new battery and now my ABS anti brake system light came on and my mechanic says I need to replace the ebs computer module? Does this happen often?

What is your question?

I'm getting a warning light about my Anti lock brake and all brake services ARE OFF... SO THE COMPUTER PART THAT WORKS THAT HAS MALFUNCTIONED RIGHT AFTER i HAD A BATTERY PUT IN. THIS HAPPENED LAST TIME i GOT A BATTERY. THEY HOOKED IT IN WRONG AND IT RUINED PART OF THE ELECTRICAL GRID INSIDE THE CAR. ANYONE ELSE HAVE THIS WHEN BATTERY IS PUT IN?

How long has your 1990 Mercedes-Benz 300CE had this problem?

Just got it. I have a 300 C class (2008)