Key on, engine off should be 20ma as pesuazo stated.
As you hit the starter it should jump about 50ma maybe more and should leave about 20ma of enrichment on a cold running motor. This enrichment goes away fast as the O2 sensor heats up and goes away with the first engagement of closed loop.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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