Do you get a long high pitched beep along with the flashing green light when you select reverse or press the button on the dash?
The controller will detect a break in the circuit of a faulty sensor and disable both front and rear sensors.
You could use VCDS to check the measuring blocks and see if the front sensors are actually working and picking up a signal, in which case it could be the sensors speaker that has failed.
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Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
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