If the O2 sensor did fail, it will take a while for the adaptation to calibrate the fuel mixture again...The shop should have reset this after making repairs, but if not, it will reset after a while.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM