Just had same code(with total lack of power)on
Viano 3.0CDI. We found across 8 different suppliers of code explanantions 3 conflicting
descriptions,
1, with solus)Charge air system offset drift under engine load.
2,Litescan and other sites)Fuel pump 'B' circuit
low.
3,Merc forums)NAF Sensor signal plausibility.
After checking air leaks,rail pressure and boost
pressures it turned out to be Turbo Actuator, for
which you nornally get boost pressure codes.
Hope this helps
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