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P0746 and P0750

8369 Views 1 Reply 2 Participants Last post by  Benz962

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.
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