2018 Audi S4 problems

Filed Jun 6, 2025 · Engine · MO

Water pump defect for the 3.0L ea839 turbo engine found across many Porsche and Audi models. Defect causes damage to vacuum lines, thermostat, and can eventually lead to engine failure if not resolved. No way of knowing this is happening until you start to lose coolant (which will throw an engine code), but by that point the damage is done. There was a recall for the previous generation vehicle water pumps.

Filed Mar 13, 2025 · Engine · NC

My 2018 Audi S4 has a catastrophic engine failure issue and this is common with the EA839 engine. There is a knocking in the motor that is caused by internal engine parts (rocker arms needle bearings) becoming loose and dislodged. The metal shavings travel in the motor oil and destroy the engine from the inside. Hendrick Audi northlake examined the car on February 26, and recommended a new engine be installed at a cost of $32,000. I contacted Audi customer care and they reviewed the case only to offer me no assistance with the new engine expense. My Audi S4 is a 2018 with less than 47k miles, and I am the fifth owner. I have been reading a lot of threads on Audi forums as well as Reddit about this problem, and this is not rare. This should be a class action lawsuit against Audi for making and selling a defective product. The EA839 engine from 2017 to 2020 is a ticking bomb from day one, almost engineered to fail prematurely. And Audi does nothing to remedy the problem. That is why I would like for the federal safety agency to get involved in this situation. Please look into this and let me know what I can do to assist with this. I can be reached at [XXX] or [XXX] . Thank you!! INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Apr 7, 2024 · Engine · IN

PCV housing and lines failed. Caused pressure to build up thus shooting off the oil cap shooting oil everywhere! in addition to that it is a huge fire hazard considering the turbo is right next to it.

Filed Dec 20, 2022 · Suspension · MA

Audi Dealer inspection revealed Rear spring is broken and mounts are deteriorating. Dealer states not common and would result in accident if not repaired. Research indicates broken springs common with certain Audi vehicles (A4/S4, Q5 & Q7), especially 2018 model year. See Audi World forum website. It would appear these springs are defective and will result in accident, injury and death. Audi refuses to acknowledge issue and issue recall.

Filed Apr 9, 2018 · Brakes · 4,000 miles · NV

The vehicle's pre sense auto-braking and braking alert jolt has been activating erroneously and have almost caused accidents at speed. The system cannot be permanently disabled, it deactivates upon ignition restart. The system has erroneously and aggressively jolted the breaks on several occasions on curves, especially when cresting a hill with vehicles parked on the downward sloap. Clearly, it is mistaken the parked vehicles for a potential impact, either aggressively jolting the breakers and/or breaking. This is not only very frightening but on a slippery surface, would have caused an accident. This feature also activated on the highway at 65+ MPH while safely changing lanes, and almost LED to my vehicle being rear-ended. There should be a way for a driver to permanently disable or customize this feature to better adapt to environmental and/or unique driver conditions. As is, this feature has been dangerous!

Filed Feb 15, 2018 · Body · 5,800 miles · IL

There are two large "underride guard" panels on the underside of the vehicle that are fastened by small, loose-fitting plastic clips. There is also felt sound-deadening material on the exterior side of this panel. When the vehicle is driven in rain or snow, the panel collects snow or water under normal driving conditions and breaks free unexpectedly, causing the panel to contact the road and drag on the ground. This dragging causes a "rudder effect," pulling the vehicle rapidly and unexpectedly in an unpredictable direction. The vehicle is in motion at varying speeds when this occurs; it has occurred at approximately 30 miles per hour, 40 miles per hour and 65 miles per hour.

Filed Nov 28, 2017 · Acceleration, Engine · 1,300 miles · TX

When driving in manual mode and transition from on the throttle to off-throttle, there is a 1-2 second delay before the engine stops accelerating and transitions to deceleration. Especially in first gear, this means that the vehicle continues to accelerate for that period of time. I drove another model of audi with the same engine/transmission (2018 s5) and it exhibits the same behavior. Since the car does not have a physical throttle cable, this would seem to be caused by the throttle not closing as commanded by the ecu or there being a delay in the throttle being commanded to close. This has not caused a collision but easily could.