On the cars 1981 & later MB's the air pump is used as a "warm-up" device. Causes the catalytic converter to come on-line more quickly. So that the O2 sensor & computer can take charge of the amount of emissions produced.
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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
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