I learned a little today. Depressing the odo button and turning the key on doesn't give any codes. However if I do the key on-off three times it gives me the P0299. I didn't realize that until now. My bad. Anyway the scanner at Auto Zone pulled the code and is decoded as "boost pressure low". I have a boost gauge and it is definitely making less boost but I'm assuming because of less fueling. The turbo sounds fine, so I' going to pull apart the intake and look for blockages. I guess the boost pressure sensor will come next. So does anyone know where the boost pressure or if it the same, the MAP sensor is on an '05?