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Q: What sensor sounds to be the problem. on 2001 Mercedes-Benz E320 4MATIC

I have a 2001 Mercedes Benz E20 Sport. When I drive it and the engine would run for a couple hours it shuts off and I have to wait 15 minutes to an hour and it will start up. It is happening now after around 15 minutes after starting and takes at least an hour to start. It's getting worse. I was told it was the crankshaft position sensor and told it was the Oxegen Sensor. I would appreciate any kind of diagnoses that maches the symptoms.

Thank you
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The O2 sensor won't come into play when starting the car. You need to determine if you are loosing spark or fuel first. The crankshaft position sensor is used by the computer to calculate when to send spark and fuel to the engine so if you loose the crank signal it is likely you will loose spark and fuel. But if you have spark and don't have fuel then you would start trouble shooting the fuel side of the equation. Best to put a fuel pressure gauge on the engine to determine fuel pressure reaches spec on cranking. It could be so many things, if the fuel pressure regulator leaks it will loose pressure, if the temperature sensor is sending a false temp reading to the computer the computer may thing it is below freezing and flood out the engine (like too much choke on carburetored cars years ago). Replacing parts without testing them and proving they are wrong is rarely cost effective. Autozone have some popular workshop manuals for free on line once you register (for free) on their website There is also a company that independent auto repair shops buy their information from that the same information inexpensively to do it yourselfers. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate
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it's very easy to remove the crank sender and watch the
resistance with a digital VOM while you heat it with a heat gun. it will always fail at high temp, but usually does not generate an active or stored code. this is the reason that MB specialty shops don't work on Chevys or Fords; we know MB's and their common problems.
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