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GL Class (X166) 2013-2015 after facelift became GLS (X166)

'14 GL 450 M278 P0299

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Old Aug 21, 2023 | 10:13 AM
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gladerider
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GL450
'14 GL 450 M278 P0299
i got a P0299 a couple of nights ago. have 140k on the clock
after doing some research, it seems like the code is caused by either: a) turbo wastegate rod causing pressure issue; or, b) vacuum pump or hose caused pressure issue. i just checked the wastegate rod and both sides rods don't shake.
i am going to track vacuum pump side.
anyone have had this issue? any tips?

thanks.
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