2018 Audi S5

26 complaints on file, page 1 of 2.

1. Filed Dec 14, 2025Failure Dec 12, 2025Orinda, CAEngine

   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.

   NHTSA complaint 11704929
2. Filed Dec 8, 2025Failure Nov 10, 2021Pahoa, HIAir bags, Seat belts, Seats

   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: Airbag warning light illuminates and a message appears indicating the passenger airbag is off, along with a chime. Additional Notes: I cannot safely use or sell the car because the required safety repair is inaccessible. Audi’s refusal to provide transportation makes it impossible to complete the mandated recall.

   NHTSA complaint 11703772
3. Filed Nov 16, 2025Failure Nov 3, 2025Fredericksburg, VAEngine

   VEHICLE Year: 2018 Make: Audi Model: S5 Prestige Trim: 3.0 TFSI (EA839 V6 Turbo) Mileage: 86,000 Engine Code: CWGD COMPLAINT TITLE Latent Engine Failure – EA839 Piston Skirt + Rocker Arm Defects – Dealer Broke Engine Cover, Left Wiring Harness Dangling – Audi Denies Despite Having DIY Receipts For Maintenance DESCRIPTION At 86,000 miles, my 2018 Audi S5 Prestige suffered internal engine failure from metal debris and cylinder wall scoring. Dealer borescope showed: Metal in oil filter (bearing + non-ferrous “other metal”) Deep scoring on multiple cylinders No check engine light. No power loss yet. Still drivable — but seizure is imminent. DEALER NEGLIGENCE AT [Audi Of Chantilly] (Penske Automotive Group): Engine cover broken — not reported Wiring harness retainers/harness clips left undone on both sides after spark plug removal → Improper reassembly risks damage to harness and engine/components — safety hazard. This matches TWO known EA839 defects: Piston Skirt Cracking – Sept 2025 Warranty Extension covers identical symptoms (debris + scoring). Denied only for 6,000 miles over 80k cap. Pre-06/2018 Rocker Arm Needle Bearing Failure – Audi revised mid-2018 (PN 06M109417H → 0P2109417, double bearing size) because originals shed metal. Garage Auto Sports: “Known to fail… Audi fixed it.” Link AudiWorld: 200+ cases Link AoA DENIAL – FALSE “Over mileage” → Rocker defect has no cap “Undocumented maintenance” LIE → All oil changes DIY with Audi 508.00 oil + OEM filters → Amazon invoices attached → Never asked for proof $32,000 quote. 100% denial. SAFETY RISK Sudden seizure at speed No warning Dealer damage worsens risk REQUESTED ACTION Investigate EA839 2017–2018 for piston + rocker failures Recall / extend warranty for pre-06/2018 builds Probe denials without proof request + dealer negligence ATTACHMENTS Denial letter Dealer Diagnostic 32k Quote Borescope report Amazon receipts Broken cover + undone retainers photos Screenshots (links above)

   NHTSA complaint 11699716
4. Filed Aug 5, 2025Failure Jun 20, 2025Chicopee, MAUnknown or other

   Vacuum line has coolant due to water pump failure and over heating of engine. Whole water pump and coolant reservoir plus hoses need to be replaced before additional damage to vehicle.

   NHTSA complaint 11678414
5. Filed Jul 10, 2025Failure Jul 10, 2025Missouri city, TXEngine

   To Whom It May Concern, I am submitting this complaint to report a mechanical issue with my 2018 Audi S5 Sportback. Around 57,000 miles, the engine began making a noticeable ticking noise, which I have been advised is due to failing rocker arms. This issue has raised serious concerns, as it can lead to engine misfires, reduced performance, and potentially catastrophic engine damage if left unresolved. The problem appeared without warning, despite regular maintenance and no prior engine alerts. I believe this may be a defect affecting other Audi models with similar engines, and I urge the NHTSA to investigate whether a recall or technical service bulletin should be issued. Vehicle Information: Make: Audi Model: S5 Sportback Year: 2018

   NHTSA complaint 11672422
6. Filed Mar 8, 2025Failure Mar 1, 2024Hazard, KYEngine

   While driving, my Audi overheated randomly, started smoking, had to be towed. Had 72,800 miles, was serviced by Audi at 70k miles and all prior recommended services. Towed to Audi dealership, quoted 29k in engine repairs, Audi could never tell me why engine overheated. Would not cover any expense because “i didn’t buy it there”. Insurance denied two claims because Audi reported it as engine failure although they couldn’t prove what happened to cause the heating, said it was one of the worst engine overheating they had seen. Prior to overheating, service driver system popped up for the first time. Temperature gauges were normal. Will not start or run since. No accountability taken by Audi at all, even through corporate. I believe my safety was at risk because the engine would have caught on fire had I not of noticed or pulled over. A Good Samaritan even pulled behind me to check on me because they saw it smoking in passing. I have a video of Audi inspection. Date is estimate of event, I would have to research. Vehicle was purchased by prior owner as cpo from Audi at 30k miles and serviced since at same Audi dealer every recommended service and prior if issue arose, I have all service records.

   NHTSA complaint 11647150
7. Filed Oct 21, 2024Failure Jun 12, 2024murphy, TXAir bags, Fuel/propulsion system, Parking brake1 injured

   •Parking Brake Issue: The parking brake failed to disengage after stopping, leading to an accident. •Intoxalock Device Malfunction: The Intoxalock device malfunctioned with incessant beeping and intermittent error messages, causing distractions. •Previous Complaints and Lack of Resolution: Previous complaints about the parking brake and Intoxalock device were dismissed without proper investigation or resolution. •Parking Brake Failure: The parking brake failed to hold the car, leading to uncontrollable movement and collision with an obstacle. •Intoxalock Device Malfunction: The Intoxalock device malfunctioned, causing distractions and contributing to the accident. •Financial Burden and Lack of Refund: Intoxalock placed the account in collections despite timely payments and failed to refund lockout fees. •Safety Concerns: Parking brake malfunction and faulty Intoxalock device. •Installation Issues: Unprofessional installation and lack of functionality. •Customer Impact: Dangerous situations and potential vehicle damage. Intoxalock’s faulty installation and negligent response to previous complaints led to a parking brake failure and subsequent accident. The incident resulted in significant damage to the vehicle and highlighted the company’s lack of accountability for customer safety. Legal action is being considered due to the ongoing safety risks and unresolved issues.

   NHTSA complaint 11621015
8. Filed Jul 9, 2024Failure Jul 8, 2024Midlothian, VAEngine

   After driving for 7 to 8 minutes less that 45 mph, a yellow warning lamp and an audible warning indicating unsafe coolant temperature displayed on the dash. An overheating engine is unsafe for me and drivers near me. I immediately pulled over and turned off the A/C. I then turned on the heater, and after 15 minutes slowly drove 5 minutes to a repair shop (Import Autohaus, Hull Street). The repair shop diagnosed a defective water pump. The pump has not been inspected by anyone other than the mechanics at the repair shop.

   NHTSA complaint 11600570
9. Filed Mar 23, 2024Failure Mar 2, 2024Hazard, KYEngine, Power train

   I received a coolant overheating message, pulled to side of road. Let vehicle cool off although it just showed coolant warning and actual engine temperature showed normal along with oil temperature. Started car back up and it was ok, drove about a mile, engine started steaming, white smoke out of exhaust, system failure had to pull off and be towed. Engine is destroyed at 72,833 miles.

   NHTSA complaint 11579095
10. Filed Dec 4, 2023Failure Apr 10, 2023Kansas City, KSEngine

    I was returning home from visiting family. My drive was approx 140 miles home. The car was running/driving normally when I stopped at a gas station to get a snack. When I came back to my car and attempted to start it, it would not start and had camshaft and crankshaft sensor DTC's. I had to tow the car to my repair shop who determined that the issue was the rocker arms. Despite performing regular maintenance above and beyond what the manufacturer recommends, two rocker arms fell apart inside the engine (needle bearings came out) and sent metal through the engine, causing it to need to be replaced. It was later determined that this was a known issue by Audi, and that they redesigned the rocker arms at a later date. The did not issue a recall or any extended warranty for the effected models. This cost me $16,349 out of pocket to repair. I contacted Audi several times and they refused to rectify the issue. I have came across several others who have experienced the same issue. I have supporting documentation as well as part numbers and dates that I can provide upon request. This type of issue is a saftey concern because this can leave a driver stranded. When this issue happend I was over 75 miles away from home. Luckily I was able to find a tow truck and had the funds to cover the expense of having the car towed back to my home town. However, this issue could leave someone stranded in the middle of nowhere if they werent as lucky as I was.

    NHTSA complaint 11558380
11. Filed Sep 18, 2023Failure Sep 18, 2023Austin, TXAir bags, Adaptive cruise control, Assist

    The system warning keeps coming on, I’ve tried to schedule appointments with Audi since 2022 and they have zero appointments available

    NHTSA complaint 11545179
12. Filed Sep 5, 2023Failure Sep 5, 2023Bonsall, CAUnknown or other

    The sunroof exploded. Driving on a good quality highway (CA76), no temperature extremes, no bumps or potholes. Heard what sounded like a gunshot. Pulled over thinking it might be a tire failure, to find my sunroof severely shattered. There was no debris inside the car, other than the shattered glass itself.

    NHTSA complaint 11542769
13. Filed Jun 26, 2023Failure Jun 12, 2023Kennebunk, MESuspension

    My 2018 Audi S5 Prestige with 59K miles meticulously maintained by the dealer had the Suspension Warning light came on about a week ago. I brought it to my local Audi mechanic and they found the right rear spring had broken about 1/3 of the way from the base and the shock had been damaged from the spring breaking. They attributed it low quality steel being used in the springs Audi is using. Luckily it was a rear spring as I understand a front spring breaking at speed could be catastrophic.

    NHTSA complaint 11528956
14. Filed Aug 23, 2022Failure Aug 23, 2022Charleston, SCEngine

    The 2018 year for the Audi S5 has a notorious rocker arm failure within the engine. Audi is aware of this problem because they have revised the part for later build dates. However, they have failed to remedy the issue for the vehicles that fall within the problematic build dates. Once this failure occurs, it is catastrophic and will require a new engine.

    NHTSA complaint 11480742
15. Filed Jul 19, 2022Failure Jul 11, 2022Annapolis, MDSteering

    The lever that locks and unlocks the steering column for proper driving position fell off. The single bolt holding the lever fell out followed by the lever. This occurred when the driver utilized the lever to reposition the steering wheel. The steering wheel was not locked into position when the lever fell off, so the steering wheel was subject to movement while driving.

    NHTSA complaint 11474677
16. Filed May 13, 2020Failure Dec 10, 201810 milesArlington Heights, ILElectrical system, Electronic stability control (esc), Visibility/wiper

    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 FIX THE ISSUE. THE DEALERSHIP REPLACED THE "MOD BOX" TWICE, WHICH SEEM TO FIX MOST OF THE SENSOR RELATED ISSUES BUT ISSUES STILL ARISE AND I AM SKEPTICAL AND AFRAID OF DRIVING THIS CAR. *TR

    NHTSA complaint 11324352
17. Filed Dec 30, 2019Failure Dec 27, 201929,000 milesGranger, INVisibility/wiper

    DURING A DRIVE ON AN INTERSTATE HIGHWAY IN TENNESSEE ON12/27/19, THE SUNROOF SUDDENLY EXPLODED. SPEED WAS APPROXIMATELY 75-80 MPH ON A CLOUDY DAY WITH THE TEMPERATURE IN THE LOW 60'S F. WITHOUT ANY PRIOR INDICATIONS, THERE WAS A LOUD BOOM. A SECTION OF THE SUNROOF APPROX 18' IN DIAMETER SEPARATED FROM THE WINDOW AND BLEW BACKWARDS ONTO THE ROAD. SMALLER SHARDS OF GLASS FELL INWARD ONTO THE SUN SHADE INSIDE THE CAR.

    NHTSA complaint 11292049
18. Filed Dec 14, 2019Failure Jul 10, 201814,000 milesSAN Francisco, CAService brakes, Unknown or other

    I WAS DRIVING ON A BIG HIGHWAY DOING ABOUT 75MPH AND ALL OF A SUDDEN FOR NO REASON I GET A BIG PRESENSE WARNING FLASH ON MY CONSOLE, THEN A TRANSMISSION ERROR, THEN TIRE PRESSURE ERROR, THEN ENGINE MALFUNCTION ALL IN A ROW AND MY CAR JUST TOTALLY SHUTS OFF AND I HAD TO COAST OVER ONTO THE SHOULDER. I'M HONESTLY JUST SHOCKED I MANAGED TO GET TO THE SHOULDER WITHOUT BEING HIT BY SOMEONE. AFTER I TURNED THE CAR OFF AND BACK ON IT SEEMS TO BE OKAY OTHER THAN THE MALFUNCTION INDICATOR LAMP MIL LIGHT IS STILL ON. THIS HAPPENED MULTIPLE TIMES OVER SEVERAL MONTHS, PRESENSE WOULD ACCIDENTLY TRIGGER AND PUT MY CAR IN VERY COMPROMISING SITUATIONS AND ALMOST CAUSED A SERIOUS ACCIDENT MULTIPLE TIMES.

    NHTSA complaint 11289072
19. Filed Aug 28, 2019Failure Aug 28, 201936,300 milesMacomb, MIElectrical system, Seat belts

    TL* THE CONTACT OWNS A 2018 AUDI S5. WHILE DRIVING VARIOUS SPEEDS, THE SEAT BELT WARNING CHIME CONTINUOUSLY SOUNDED EVEN WITH THE SEAT BELT ENGAGED AND IN USE. THE SEAT BELT WARNING INDICATOR ALSO REMAINED ILLUMINATED WHILE DRIVING. THE CONTACT DROVE THE VEHICLE TO AUDI BIRMINGHAM MICHIGAN (34602 WOODWARD AVE, BIRMINGHAM, MI 48009, 248-645-5930) WHERE AN APPOINTMENT WAS SCHEDULED. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. THE VEHICLE HAD NOT BEEN REPAIRED. THE FAILURE MILEAGE WAS 36,300.

    NHTSA complaint 11251967
20. Filed Apr 9, 2019Failure Feb 19, 20197,000 milesRiverside, CTParking brake, Power trainCrash

    TL* THE CONTACT OWNS A 2018 AUDI S5. THE CONTACT STATED THAT THE GEARBOX AND PARKING BRAKE RELEASED WHILE THE VEHICLE WAS IN PARK. AS A RESULT, THE VEHICLE ROLLED AWAY AND CRASHED INTO A CONCRETE BARRIER. THE AIR BAGS DID NOT DEPLOY. A POLICE REPORT WAS FILED. THERE WERE NO INJURIES SUSTAINED. THE VEHICLE WAS TOWED TO AUDI GREENWICH (181 WEST PUTNAM AVENUE, GREENWICH, CT 06830, (203) 661-1800), BUT THE FAILURE COULD NOT BE DIAGNOSED. THE BODY DAMAGE WAS REPAIRED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS APPROXIMATELY 7,000. *JS

    NHTSA complaint 11194999