Oh my, you all and getting carried away with one TSB you read. You need to change the air filter. If anyone is getting a p0171 code on a 96 and newer Benz, 9 out of 9.9 cars the Mass Air Flow Meeter is bad. Plugged air filters and the ones like K&n cause this problem. Find a reputable repaire shop, and not just the dealer. Dont go messing with the ECM.