DSLT223LDownload as PDFAdvanced Tune-Up/Computerized Engines LabDiesel TechnologyProfessional/Technical ProgramOverviewRequisitesSimple RequirementsCollapse AllDSLT-223 CorequisiteDSLT-223 Take DSLT-223;DSLT-123L PrerequisiteDSLT-123L Take DSLT-123L;DSLT-133 PrerequisiteDSLT-133 Take DSLT-133;