I actually suspect that too, mine freaked out a little while ago when I was coming to a stop, it went erratic between 0 and 1 bar very quickly for about 2 seconds then went to 1.5 and stayed there like normal.....never happened again since.....I was about to shut the engine down as soon as I saw it move! (paranoia-trained reflexes)

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)