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hi i have a Mercedes W203 646 engine 220cdi the problem is that it showed check engine light took it the workshop and diagnosed it and the error was low boos pressure. i have change the boost pressure with the original part number and still the same problem i have also checked to see if there are some air leakages but none is found on the horse pipes and inter-cooler i have also tested the EGR its also fine and still low boost. i have also tried different actuators and and different turbo but still the problem is the same