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Dual distributer drive belt vs O2 sensor failure.

Engine

Vehicle Information: Model: 911 C2 cabriolet (964); Year: 1990; Body Type: Convertible; Engine (type, size, modifications): 3,6 L; Total Mileage: 54,600;

We recently purchased a 1990 911 C2 cabriolet (964) and we are concerned about the dual distributer and it's drive belt. We have read that if this belt fails that serious damage can occure to the engine if you don't recognise it and turn the engine off. We've also read that if one of many engine sensors (oxygen sensor for one)fail it may cause the DME control unit to switch to emergency mode or "limp home mode". This causes RPM and acceleration to be seriously limited.On the surface, to a new and inexperienced Porsche driver, these two failures sound similar in how the car may respond, ie: rough runnung.Is there a difference in how the car drives with these failures? I can imagin a senario where I would rather limp to a garage than stop on a deserted road. On the other hand I'd rather not have to pay for an engine rebuild if I can help it. Any thoughts on how to differenciate between the two failures while driving down the road?

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