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The power for all the O2 sensor heaters all come from the Z7/39 connector sleeve which is powered by k9 relay of the K40 relay module. The power comes from one of the fuses on top of the K40. The K40 is located in the electrical center on the right side of the engine compartment (pass side). The box top comes off with some screws and the K40 is to the front and has a number of fuses on the top.
If the circuit is out and all the heaters are dead you may get a performance code quicker that a heater code.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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