P0299 -- Turbo/super charger – low boost Mechanical fault
Says mechanical fault, check for full stroke of turbo vanes/actuator. Might try spraying it good with some penetrating oil and working the vane rod by hand while you have the vacuum line disconnected or use a hand vacuum pump to exercise the vanes.
Could be a problem with the vacuum solenoid sticking. You can temporary bypass it for a test if it happens again. See enclosed picture.
Turbo modulator valve should give totally different DTC if it is having problems.
Next, think about replacing ALL vacuum lines with silicone hoses of the proper size.
The factory ones are crap, especially the small thin plastic pipe that goes between the turbo modulator valve and the turbo vane actuator, it can split or partly collapse due to heat exposure. See pictures below (2).
Good place to order silicone hose by the foot:>
https://www.siliconehose.com/
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