9.7

really awful
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
650 miles

About These NHTSA Complaints:

The NHTSA is the US gov't agency tasked with vehicle safety. Complaints can be spread across multiple & redundant categories, & are not organized by problem. See the Back button — blue bar at the very top of the page — to explore more.

Get notified about new defects, investigations, recalls & lawsuits for the 2018 Audi S4:

Unsubscribe any time. We don't sell/share your email.

Get free help with your lemon!
close ad
problem #2

Apr 062024

S4

  • miles
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.

- Noblesville, IN, USA

Add Complaint
problem #1

Nov 142017

S4

  • 1,300 miles
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.

- Cedar Park, TX, USA

Add Complaint