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Audi · Mid-Size · 2017–2026

Audi RS4 B9

Weaknesses, engine ratings and buying advice

★★★★★
3.0 / 5.0 · Based on 5 engine variants
Most Fun Engine

450 PS

2.9L TFSI V6 BiTurbo Benzin

BiTurbo V6 replaces V8 — faster, wider, less soul

Legendary!

Body Variants

The Audi RS4 B9 is available as Avant and Limousine — choose your body type for specific insurance data:

Avant
5 Engines
view Avant →
Limousine
5 Engines
view Limousine →

Generations

Engine Overview

The Audi RS4 B9 is available with one engine variant at 340 hp.

RS4 · Benziner Mild-Hybrid· 470 PS
2024 2026
Be Careful 6 weaknesses

The Audi RS4 (Benziner Mild-Hybrid, 470 PS) has the DNXB (2.9L TFSI V6 BiTurbo) — rated: "Be Careful", 6 known weaknesses.

Vehicle Weaknesses

WeaknessCost
✖Recall: Rear Axle Stress Corrosion Cracking (42L1/42L5)

Recall 42L1/42L5: Stress corrosion cracking in the rear trailing arm can increase play. Affected: build years 2019–2021. Missing wheel alignment after the initial recall caused severe rear tyre wear.

Symptoms: Heavy uneven tyre wear at the rear, air loss from rear tyres in advanced cases
Ad Achslenker rear A4 B9control arm rear axle 8W0 505 465
 Low
✖Recall: Seat Heater Wiring — Front Passenger Airbag Deactivated (74E3)

Recall 74E3 for S4 B9 (build years 2018–2020): a seat heater wiring fault can cause an occupancy sensor error and deactivate the front passenger airbag.

 Low
!AdBlue System: Injector Nozzle and Pump Failure (TDI)

On the S4 B9 TDI, AdBlue injector nozzles can block through crystallisation or the urea pump can fail. After a fault message, a countdown to engine lock-out begins.

Symptoms: 'AdBlue Fault' warning, countdown to engine lock-out after 1,000 km, fault code P202A or P204E
from 100,000 km
Ad AdBlue fuel injector Audi 3.0 TDISCR Harnstoffpumpe DTPAAdBlue Tank 8W
 High
NHTSA Owner Complaints
Above Average
27 complaints · 2016–2024
Electrical
15
Backup Camera/Sensors
9
Other
6
Engine
5
Brakes
2

Top Reported Issues

⚠ Electrical (15 complaints)
⚠ Backup Camera/Sensors (9 complaints)
⚠ Other (6 complaints)
Source: NHTSA (nhtsa.gov) · 2026-03

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Known Problems and Issues

A total of 50 weaknesses have been documented for the Audi RS4 B9 (2017–2026) — 30 engine-related and 20 vehicle-related. Typical issues affect Other, Electronics, Suspension, Brakes.

What to watch out for with the Audi RS4? See the detailed listing of all engine and vehicle weaknesses in the sections above.

Frequently Asked Questions

What problems and weaknesses does the Audi RS4 B9 have? +
The Audi RS4 B9 has 30 known engine weaknesses and 20 vehicle weaknesses.
What should I look for when buying a used Audi RS4 B9? +
faq.watch_a_none
Which engine is recommended? +
Be careful: DECA (2.9L TFSI V6 BiTurbo), CWGD (3.0L TFSI V6), DTPA (3.0L TDI V6), DTNS (3.0L TDI V6), DNXB (2.9L TFSI V6 BiTurbo). No engine is rated 'Good Choice'. The most fun to drive is the DECA (2.9L TFSI V6 BiTurbo).
Which Audi RS4 B9 engine is the most fun? +
The {code} ({displacement}) offers the most driving fun in the Audi RS4 B9 — rated: "Legendary!". {description} 450 hp twin-turbo V6 replaces the NA V8. 0-60 in 4.1 seconds, wider than its predecessor, technically superior. But the sound doesn't touch the B7, and the auto-only gearbox leaves no room for manual nostalgia. The RS4 for people who rank lap times above goosebumps.
Is the Audi RS4 B9 worth buying used? +
The Audi RS4 B9 requires careful consideration — choosing the right engine variant is crucial.
What horsepower variants are available for the Audi RS4 B9? +
The Audi RS4 B9 is available with engine variants from 340 to 470 hp. Petrol: DECA (2.9L TFSI V6 BiTurbo), CWGD (3.0L TFSI V6), DNXB (2.9L TFSI V6 BiTurbo). Diesel: DTPA (3.0L TDI V6), DTNS (3.0L TDI V6).

Last updated: February 2026 · All information without guarantee