Audi S4 B9
Weaknesses, engine ratings and buying advice
354 PS
3.0L TFSI V6 Benzin
354 hp company car — objectively fast, subjectively empty
Fun to Drive!Body Variants
The Audi S4 B9 is available as Limousine and Avant — choose your body type for specific insurance data:
Generations
Engine Overview
The Audi S4 B9 is available with 4 engine variants — from 340 to 354 hp. 2 variants had engine changes — the model year is crucial.
The Audi 3.0L TFSI V6 (Benziner, 354 PS) has the CWGD (3.0L TFSI V6) — rated: "Be Careful", 8 known weaknesses.
The Audi S4 (Benziner, 354 PS) has the CWGD (3.0L TFSI V6) — rated: "Be Careful", 8 known weaknesses.
The Audi 3.0L TDI V6 (Diesel Mild-Hybrid, 341–347 PS) comes with 2 different engines: DTPA (2019–2024, Be Careful) und DTNS (2019–2024, Be Careful). Pay attention to the model year for the 3.0L TDI V6!
The Audi S4 (Diesel Mild-Hybrid, 341–347 PS) comes with 2 different engines: DTPA (2019–2024, Be Careful) und DTNS (2019–2024, Be Careful). Pay attention to the model year for the S4!
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 |
Top Reported Issues
Alternatives
Hyundai Ioniq 6 CE
Mittelklasse (2022–2026)
BMW i4 G26
Mittelklasse (2021–2026)
BMW 4er G22
Mittelklasse (2020–2026)
Subaru Legacy BT
Mittelklasse (2020–2025)
BMW 3er G20
Mittelklasse (2019–2026)
Toyota Camry XV70
Mittelklasse (2019–2025)
Known Problems and Issues
A total of 34 weaknesses have been documented for the Audi S4 B9 (2016–2024) — 19 engine-related and 15 vehicle-related. Typical issues affect Other, Electronics, Suspension, Brakes.
S4 (CWGD, 2016–2018) — Be Careful: Rocker Arm Roller Failure (GP0 Production), Water Pump Internal Failure with Coolant in Vacuum System, 48V Mild Hybrid System Fault (from 2019 Facelift). Power: 354 PS.
S4 (DTPA, 2019–2024) — Be Careful: Low oil pressure from variable oil pump, Camshaft breakage (material defect), Timing chain drive worn (4-chain system). Power: 341–347 PS.
S4 (DTNS, 2019–2024) — Be Careful: Timing chain wear and tensioner failure, Camshaft fracture due to material defect, Coolant loss from defective control valves. Power: 341–347 PS.
What to watch out for with the Audi S4? See the detailed listing of all engine and vehicle weaknesses in the sections above.
Frequently Asked Questions
What problems and weaknesses does the Audi S4 B9 have? +
What should I look for when buying a used Audi S4 B9? +
Which engine is recommended? +
Which Audi S4 B9 engine is the most fun? +
Is the Audi S4 B9 worth buying used? +
What horsepower variants are available for the Audi S4 B9? +
Last updated: February 2026 · All information without guarantee