I have 2015 ML350 gas with CEL code P0451. Three codes came up all P0451 (evaporative Emission System Pressure Sensor Switch out of operating range/ Does the codes indicate that there are 3 causes that give rise yo code P0451. Do you think that can be repaired by independent mechanic? Or just see the dealership for diagnosis and repair first for opniom?Di d any body have this code P0451 before and how much did it cost from the dealership. Already did the gas cap ( turning 4X) and oil dipstick remedy still the CEL is on. Do not have have any performance problem … acceleration, starting , idle ok and other mechanical operation...

Fixed by dealer by updating software... Diagnostic cost …$150