P0 380 has nothing to do with previous work.

P0 380 means that the glow system relay (computer) reported a fault, most likely a bad control relay. Very easy to test!
The glow relay MB number 022-545-75-32 lists for $83.

__________________
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