Assistance please !!!!!
Have a w211 e350 M272 engine with a persistent P0746 and P0750 fault coming on after 30 kms (18.66 miles)
as per my diagnostics-
P0746- Mixture correction additive(bank1) signal not in range
P0750- Mixture correction additive (bank 2) signal not in range
Diagnoses thus far- Tested the secondary pump (is a bit noisy on start up and when actuated)
Cleaned EGR valve.