P132B is the result of the turbocharger to build sufficient boost during the VGT learn process or under certain load/speed conditions while driving. Barring faults with the MAF, MAP, BARO and EOT sensors and any leaks in the intake or exhaust system, the turbocharger itself is still the lost likely culprit. To answer your question specifically, intake leaks before OR after the turbocharger can cause low boost... however a leak before the turbo would likely cause a P006A code for the MAF to set as well. MAF is critical for EGR operation and as we all know, malfunctioning EGR valve affect turbocharger operation.
To be honest with you, if you are absolutely sure you have no leaks and no other codes, it might be time to pull the turbo apart and inspect it. There is no other way to check it on the early build 2003/2004 engines.
To be honest with you, if you are absolutely sure you have no leaks and no other codes, it might be time to pull the turbo apart and inspect it. There is no other way to check it on the early build 2003/2004 engines.
