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And to better answer your question now, the tensioners are part off the variocam system which alters the cam timing at I believe 3500 rpm. Since the ramps are so chewed up and worn the cams have shifted position. Being called deviation, my assumption is the sensors reading position of the cams are telling you how far out of position the camshaft is relative to the correct position which should be zero.
When I read mine the deviation was 6 and 9. My variocam advance was still correct (I think 20 degrees of change) , but the starting point was off due to the worn plastic ramps.
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