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This paper presents a systematic measurement approach for localizing the acoustic leakage of pass-through components and for determining the pass-through effects on sound transmission loss through the front vehicle dash section. The dash section is cut from a current vehicle platform and is installed on the wall of a sound transmission loss suite in which the source side is a reverberant room and the receiver side is a quiet room. The proposed approach is based on the widely-used sound intensity technique. The transmitted point and spatially averaged sound intensities through the dash section are measured with the careful control of noise flank paths and reactive fields. The approach includes sequential steps of measurements on the dash section: (1) bare panel with all holes sealed; (2) with dash insulator installed; (3) with each of four pass-through component groups installed; (4) with all pass-through component groups installed; (5) with instrumental panel installed.