2018 Audi S5

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 ID

11704929

Incident

Dec 12, 2025

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 ID

11703772

Incident

Nov 10, 2021

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 ID

11699716

Incident

Nov 3, 2025

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 ID

11678414

Incident

Jun 20, 2025

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 ID

11672422

Incident

Jul 10, 2025

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 ID

11647150

Incident

Mar 1, 2024

•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 ID

11621015

Incident

Jun 12, 2024

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 ID

11600570

Incident

Jul 8, 2024

This bulletin provides a statement regarding the bottleneck of supply for VW approved oil types VW 504.00 and VW 507.00.

This bulletin provides information when DTC B105A1A, B103E25 is stored in 0017; fuel tank level implausible.

This service information TSB provides warranty coverage information for vehicles with a broken sunroof panel.

This bulletin provides informatoinw hent here are scratches or a coating on the cover of the instrument cluster, or particles inside of the housing.

This bulletin provides information when there is a film/visible rings on the clear glass cover of the headlight when the dipped beam is switched on.

This bulletin provides information when DTC B105A1A, B103E25 is stored in 0017; fuel tank level implausible.