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Hello, new to the forums here, having some issues with my '01 Jetta TDI.

My car seems to be going into limp mode every time I start it, often before I even put it into gear. Had my mechanic scan it and it's throwing the P1557 and P1144 codes - he seems to think it's the Turbo Actuator that's not working, but I've also read that the symptoms can also be caused by a bad N75 or simply a vaccuum leak. Anyways, any direction you guys can provide would be extremely helpful -- any diagnostic tips?

EDIT: I replaced the MAF sensor, but that didn't help any.
 
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