Error Code P0299: Turbo/Super charger underboost
So I got a check engine light last night after reaching about 5000 rpms (don't go that high too often) and took it to Autozone and got this code pulled. The description their computer put out for 'Volkswagen' is as follows:
Faulty wastegate bypass regulator valve
1. Mechanical damage at turbo/super charger
2. Faulty charge Air pressure sensor
So all that I can glean from this is that it was caused by either the diverter valve or MAF sensor. Since I've heard that a torn DV doesn't usually throw a CEL, and that I didn't notice a loss in boost (don't have a gauge to exactly confirm it), that would leave the MAF. I don't have a K&N so no oil on the MAF from that.
He cleared the codes, and it didn't come right back, but on the drive home I didn't get too high in the RPM range, either.
Guy's have any thoughts?
PS: I guess the fuel injector cleaner he sold me after pulling code P2099 (fuel injector failure) won't help much......oh well guess it won't hurt to throw it in a tank.
EDIT: I figured if anyone found this while searching and wanted to know what was done in my case to resolve the issue it would make sense to add it. I took off my MAF sensor first as that is relatively easy to do and found no reason for it to have sent the code. Next I took off the DV and found a slight tear in it. The tear was not big enough to cause all boost to leak, but enough that at higher RPMs and higher boost, the computer would notice the leak. I ordered the new "D" revision diverter valve and put it on. After riding around and getting into higher RPM range the CEL has yet to return.