M5 Expert (>4000)
Join Date: Oct 2010
Location: Cobourg Ont
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Are you reading your codes with a Peake reader? There are several Crank sensor codes that can show up as shadow codes. They don't mean that the crank sensor is bad. I have just started reading about them. They have to do with the shut down of the engine. Not sure of all the details yet, but I am getting there. It is a four stroke so when the engine starts spinning, the first pulse could be from either bank. The DME shuts the engine down and is supposed to know where it stopped the engine. Sometimes it does not stop correctly. So when the engine starts spinning it assumes it is correct but if it does not fire then it decides it is on the wrong bank and switches banks. It places a shadow code that is related to the crank sensor. In the shadow codes with the correct reading software there will be a second hex code in this format 10/00. I use that one because it is the only one I have seen.
The point that I am getting at is if you change the sensor and still get the code it has to do with the position of the engine during shut down, which would likely be compression or vanos.
You could try something simple to see if possibly it is shut down issue. Make sure you idle the car for a few seconds, make sure the A/C is off and make sure your idle is ~650. Then see if on the restart the car is code free before you shut it off then check again once you shut it off.
I suspect that you will have to change your sensor to be safe as we just don't know about these codes as of yet.
Last edited by Sailor24; 8th May 2012 at 07:36 PM.