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You will need to get that info from a.) your owners manual - which you may not have if it's a used car, or contact the dealer or Audi directly - they will ask for the serial number for the radio, and the VIN. If they don't match, you may have a problem because they can't be sure it wasn't pulled from one car and sold, stolen, whatever. etc. Is this the original radio installed in the original vehicle?
1. Your radio code is in your paperwork for your car (Its on a hard plastic card) Find it. 2. Take your registration to Vin and Ser Number for your radio to your local dealer. These codes are a guarded secret and no one code fits all. Hope this tip helps guide you in the correct direction to solve this problem.
CODES PO505 IDLE AIR CONTROL MOTOR CIRCUIT. P2781 AND PO1757 DID NOT SEE THEM IN CODE MANUAL.CODE PO505 WHAT ITS TELLING YOU.THAT YOUR STEPPER MOTOR COIL CIRCUIT IS SHORTED TO SYSTEM POWER B+ OR STEPPER MOTOR COIL NUMBER 1 2 3 4 CIRCUIT OPEN OR SHORTED TO GROUND.