2021 Audi S4 — reported problems

CarFaultIQ holds 944 evidence records for the 2021 Audi S4, drawn from official sources and owner complaints.

What the records are about, by source

Each source is kept separate: owner complaints, recalls, manufacturer communications and investigations are different kinds of record and are never added together. All model years.

Owner complaints (1,116 records, model years 2000–2022) are most frequently classified under: electrical system, powertrain (transmission & drivetrain) and brakes.
Manufacturer communications (15,566 records, model years 2000–2025) are most frequently classified under: equipment & accessories, electrical system and engine.

"Most frequently classified under" reports how the records are filed by the source. It is not a finding about causes, and a record can be filed under more than one system. Read the individual records

Evidence by model year

Records held per model year. Select a year to narrow this page to it.

Counts are not adjusted for how many vehicles were sold in each year, so a taller year is not necessarily a worse year.

Official records held

Safety recalls NHTSA 4
Manufacturer communications NHTSA 934
Transport Canada recalls Transport Canada 4
Owner complaints NHTSA 2

Explore the underlying evidence records

Where to go next

Audi S4 coverage hub Published problems, year windows and buyer guidance for this model.
Evidence Explorer — the underlying records Read the individual recalls, investigations, manufacturer communications and complaints these counts come from.
All model years of the Audi S4 Compare how much evidence is held for each year before narrowing to one.
Browse all vehicle coverage Every make and model CarFaultIQ has published coverage for.

What the records are about, by source

Evidence by model year

Official records held

Keep researching

Symptoms and warning lights in these systems

Where to go next