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Fuel to low sounds like the clogged fuel filter. I have seen codes for misfires and a code for low fuel at the same time. Check the ECT (at the rear of the engine between the engine and firewall. If its not green then replace it- only $7.00 worth of parts and u problably need it neway)
When you fix a car with lots of miles things tend to break. An engine that has not had full boost pressure now is. Your MAF might be faulty now because of the boost pressure. Also they should check to see if all the vacuum lines and hoses are correctly installed on the turbo and intake pipe. There are alot... ALOT of vacuum lines and rubber hoses that need to be removed and installed when doing a turbo on a passat and I am sure they might have forgot one or two or possibly one hose may have cracked.
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