In a sensor, in particular an impedance sensor, for example a soot sensor, which has two electrodes which are electrically insulated from another, wherein at least one outer electrode comprising a composite of metal and inorganic oxide is in the form of a layer pattern with a layer thickness of 0.5 to 20 μm, the track width of the layer pattern and the distance between the tracks are 5 to 70 μm according to the invention and the edge region fluctuates around the conductor track edge by less than 10 μm. Both electrodes may be arranged beside one another as a layer pattern in a plane. The sensor preferably has a heater. For mass production, electrodes are produced on electrically insulating oxidic substrates to form a layer pattern with a layer thickness of 0.5 to 20 μm and, after the entire surface has been overprinted with a paste containing metal powder and oxide, the electrodes are patterned in a particularly accurate manner from the printed layer to form tracks. In particular, the layer thickness of the printed layer is reduced.
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