I presume the car has KE with an EHA. As with all KE cars the easiest image of what is happening is to monitor EHA current.

One can see all the forms of electronic correction at work cause that is how they work: by changing the EHA current. The early KE cars were all positive current and lambda had correction in the range 0-16ma. The car was adjusted to 8ma in closed loop. Monitoring EHA will tell you if you have closed loop.

If you can open the circuit to the O2 sensor the range of lambda correction can be determined by the "through the Captain" method (search the archives).

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician