The "LED" pushbutton is for fuel system (check engine) information. code # 2= oxygen sensor failure
code # 4= air injection system malfunction
code # 5= EGR system malfunction
code # 17= data exchange problem in "e-box"
Note that none deal with ASR system as that is a seperate computer. Must use scan tool to retrieve codes.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)