Audi RS4 B9 Limousine
Weaknesses, engine ratings and buying advice
450 PS
2.9L TFSI V6 BiTurbo Benzin
BiTurbo V6 replaces V8 — faster, wider, less soul
Legendary!Engine Overview
The Audi RS4 B9 Limousine is available with one engine variant at 340 hp.
Vehicle Weaknesses
| Weakness | Cost | |
|---|---|---|
| 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 | 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 | High |
Frequently Asked Questions
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Last updated: February 2026 · All information without guarantee