Propping up the car for access to a thorough inspection of the Air conditioning system leaves no stone unturned.The defective Compressor (Right) swaps with a new one.The faulty Pressure Sensor Switch also needs replacement.The problem solved in a jiffy! With the new Air conditioning Compressor in place and our QC having checked all the right boxes, the Audi A4 is then pampered to a complimentary car wash and interior vacuuming.