What were the codes?? Was the air mass code P0 100 OR was it a fuel trim code P0 170 OR P1 170??

IF the codes were fuel trim then YES having a vacuum leak in the a/c system will have effect on engine codes IF the PSE system pump is inop! IF that is the case then have the A/C vacuum leaks fixed.

__________________
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