2018 Audi S5 SportbackRecalls, problems, MPG & safety

“An Audi dealer has just diagnosed my 2018 S5 Cabriolet Prestige with vacuum system contamination caused by water pump failure. I had requested the diagnostic due to small coolant leaks on the engine and loss of coolant in the expansion tank. No warning lights and no overheating yet. Not yet aware of any loss of performance. I have been advised it is unsafe to continue driving the car. Dealer has quoted me $7800 estimate to repair the car. Purchased the car in 2021 as a Certified Pre Owned vehicle, and it now has about 84K miles on the OD.”

“Component/System: Passenger Occupant Detection System (PODS) / Airbag system — Recall 74E3 / NHTSA 21V874. What Happened: The passenger airbag may switch off even when the seat is occupied due to a faulty PODS wiring connection. The warning message “Passenger Airbag Off” appears with a chime. This is an active safety recall that was issued before I purchased the vehicle, but the recall was not disclosed at the time of sale. Safety Risk: If the system shuts off the airbag incorrectly, the passenger may have no airbag protection in a crash, creating a serious risk of injury or death. Inspection Availability: Vehicle is available for inspection. I live on the Big Island of Hawaii, where there is no Audi-authorized repair facility. Reproduction/Confirmation: Symptoms match the known recall defect. Audi has confirmed the recall applies to my VIN, but no local dealer exists to inspect or repair it. Manufacturer/Dealer Inspection: Audi has refused to cover shipping to the nearest authorized dealership on Oahu, which is the only location where the recall can be performed. Therefore, the defect has not been inspected due to lack of accessible remedy. Warnings/Symptoms:…”

“THE CAR'S OVERALL ELECTRONIC RELIABILITY AND SAFETY ARE HUGE AREAS OF CONCERN. REARVIEW CAMERA AND SENSORS DO NOT ALWAYS WORK. SOMETIMES IT WILL OPERATE WHILE CAR IS IN MOTION BUT IT WILL BLACK OUT WHICH ULTIMATELY IMPAIRS THE DRIVER'S ABILITY TO REVERSE AND AVOID ANY OBJECTS AND PEDESTRIANS. THIS IS POTENTIALLY DANGEROUS IN HIGH-FOOT TRAFFIC AREA LIKE SHOPPING MALL. IN ADDITION, THE CAR'S LANE ASSISTANCE MECHANISM IS NOT ACCURATE AT TIMES AND COULD HAVE CAUSED ACCIDENTS SEVERAL TIMES. FOR EXAMPLE, THE SENSOR SOMETIMES WILL MIS-DETECT THE LANES AND WRONGLY DRIFT THE CAR OUT OF LANES, ALMOST CAUSING COLLISION WITH ONCOMING CARS OR ADJACENT CARS. MOREOVER, THE AUDI SENSOR WHICH DETECTS OBJECT AND BRAKES FOR THE DRIVER DOESN'T WORK TOO WELL. FOR INSTANCE, WHEN MAKING A LEFT TURN AT AN INTERSECTION, IT WILL MIS-CALCULATE THE ONCOMING TRAFFIC AND WILL BRAKE AND STALL THE CAR IN THE MIDDLE OF INTERSECTION. ALSO, THE AUDI SENSOR WRONGLY DETECTS THE OBJECT AROUND THE CAR SUCH AS ELEVATED SIDEWALK CURBS OR FIRE HYDRANTS AND IT RANDOMLY AUTO-SLAM THE BRAKES EVEN WHILE THE CAR IS MOVING AT 30-40MPH. THE CAR WAS IN THE DEALERSHIP REPAIR SHOP AT LEAST 5 TIMES TO ATTEMPT TO…”