Faulty Instrumentation Control Module
Instrumentation Control Module harness is open or shorted
Instrumentation Control Module circuit poor electrical connection
Engine Light ON (or Service Engine Soon Warning Light)
CAN Data Bus Instrumentation Incorrect Signal is the generic description for the P1674 Audi code, but the manufacturer may have a different description for your model and year vehicle. Currently, we have no further information
about the P1674 Audi OBDII code.