2011 Audi Q7 ELECTRICAL SYSTEM,UNKNOWN OR OTHER

THIS COMPLAINT PERTAINS TO AUDIS ADBLUE(NOX) SYSTEM. WE RECIEVED A FAULT ON A ROAD TRIP. IT STATED CAR WOULD NOT TURN ON WITHIN 600 MILES. IT STARTED TO COUNT DOWN. AFTER 3 DEALERSHIP VISITS THEY INFORMED ME THAT THE FIRST PART TO REPLACE IS A NOX SENSOR TO THE COST OF 1300 DOLLARS. I REFUSED AS I DIDN'T HAVE THAT AMOUNT. SO NOW I HAVE A CAR THAT CANT BE DRIVEN BECAUSE IT WONT TURN ON AND COMPLY WITH FEDERAL EMISSIONS. I FEEL THAT IF THERE IS A PART HAVING TO DO WITH FEDERAL EMISSIONS THEN AUDI SHOULD HAVE TO BE FORCED TO REPLACE IT LIKE THEY WOULD A CATALYTIC CONVERTER. OR NOT DISABLE THE VEHICLE IN CASE I'M IN THE MIDDLE OF NOWHERE!!!!!! AUDI SHOULD REMOVE THAT PROGRAMMING, GIVEN THE FACT THAT IN A STATE OF EMERGENCY I WOULD APPRECIATE THE ABILITY TO CONTINUE DRIVING FOR MONTHS OR YEARS(IF NEED BE) IF THE COUNTRY IS LACKING INFRASTRUCTURE. ANOTHER SCENARIO WOULD BE IF I DECIDE TO DRIVE ALL THE WAY TO THE SOUTHERN TIP OF SOUTH AMERICA. I WOULD HATE FOR MY CAR TO BE STRANDED BECAUSE OF A NOT SO CRITICAL ISSUE.