Have an 04 6.0 PSD that fails EGR test due to hi MAF @ idle. MAF is 1.8 volt & limit according to IDS is 1.6 volt. Strange part is turbo boost test shows MGP starting @ 0 psi & going to only .58 PSI. MAF volt is .4 KOEO. Have tryed good MAF sensor from another... Login to read more.