Basically,

"A catalytic motor vehicle radiator for cooling a coolant flowing through it has a catalytically acting surface for converting a pollutant into an environmentally compatible material, a temperature sensor for sensing a coolant temperature, and an attachment point for attaching the temperature sensor. The temperature sensor has an attachment for attaching the temperature sensor to the attachment point of the catalytic motor vehicle radiator, and includes an electrical identification unit for identifying the catalytic motor vehicle radiator. The attachment interacts with an attachment point of the catalytic motor vehicle radiator in such a way that, if the temperature sensor is removed from the catalytic motor vehicle radiator, the temperature sensor is destroyed."

In English,,, there's a temperature sensor on the radiator that sense the temperature of the radiator. It's used in SULEV (Super Ultra Low Emission Vehicles) Need to replace the radiator as the patent (quoted above) states that to be tamper-proof, it is destroyed if removed ( which also destroys the radiator I would imagine).

Google "Direct Ozone Reduction Catalyst Temperature Sensor Circuit High" the bimmerfest forum has some useful info

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