Faulty A/C pressure switch
A/C pressure switch harness is open or shorted
A/C pressure switch circuit poor electrical connection
Engine Light ON (or Service Engine Soon Warning Light)
Load Signal From A/C Compressor Range/Performance is the generic description for the P1566 Audi code, but the manufacturer may have a different description for your model and year vehicle. Currently, we have no further information
about the P1566 Audi OBDII code.