I have been wondering about this and would like to discuss this. I have seen many late model QVs that have their lambda sensors disconnected and the wires just sitting there. The car still runs fine. What are some of the effects? Is it safe for the car? Here is what I have been thinking. With the lambda sensor disconnected there is no V going to the Jetronic box. Therefore the duty cycle increases to a max set limit with the duty cycle at 95% or so, right? Now this makes the frequency valve open 95% of the time leading to a much richer mixture. Now is this a safe rich mixture or a too rich mixture? Is this a correct hypothesis of how a disconnected lambda sensor would effect the mixture? Now with the sensor disconnected what does the Jetronic box do besides complete an electrical path for the frequency valve? Any info would be appreciated.