When you replace the PSE pump on that car & "most" MB's after 1997, you also need to program that pump with DAS (dealer laptop) computer. That PSE pump is a computer & controls the ATA (alarm) functions, also is on the interior CAN network. The interior CAN needs to have diagnostic scan tool connected to read 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)
Retired Moderator