2021 Audi S4 problems
The Audi S4 is the high performance variant of Audi's compact executive car A4. The original Audi S4, built from 1991 until 1994, was a performance-oriented version of Audi's 100 saloon/sedan. All subsequent S4s since 1997 have been based on the Audi A4; and as the A4 has evolved from one generation to the next, so has the S4.
Like its regular A4 counterpart, all S4 variants have had longitudinally oriented, front-mounted engines. All versions of the S4 have their transmission mounted immediately at the rear of the engine in a longitudinal orientation, in the form of a transaxle, and like all Audi "S" cars, are only available as standard with Audi's quattro all-wheel drive (AWD) system, using a Torsen-based centre differential system. A more powerful internal combustion engine, larger upgraded brakes, firmer suspension, larger wheels, and distinctive sheetmetal, styling clues and badging have always been amongst the many upgrades the S4 receives over its mainstream 100 and A4 siblings. In markets where the even higher-performance Audi RS 4 is not offered, the S4 is the top-of-the-line trim of the A4 family.
A single turbocharged 2.2-litre inline five-cylinder powered the original C4 version, and a 2.7-litre twin turbocharged V6 engine was found in the B5 generation. The B6 and B7 versions shared a common 4.2-litre V8 engine, the first time that a V8 engine was placed in a compact executive car, placing it in direct competition with the BMW M3 (3.2 L inline 6) and Mercedes-Benz C32 AMG (3.2-litre supercharged V6). The B8 generation uses a supercharged 3.0-litre V6 TFSI engine and competed with the BMW 335i, BMW 335i/340i xDrive, and Mercedes-Benz C350. The current B9 generation is powered by a turbocharged 3.0-litre V6 TFSI engine, with rivals including the BMW M340i xDrive and Mercedes-Benz C450 AMG/Mercedes-AMG C43 4MATIC.
All versions of the S4 have been manufactured at Audi's plant in Ingolstadt, Germany; they are, or have been available as a four-door five-seat saloon and a five-door five-seat Avant (Audi's name for an estate car/station wagon) body styles since the model's inception in 1991. A two-door four-seat Cabriolet (convertible) S4 variant was introduced as part of the B6 and B7 generation A4 lineups. The B8 Cabriolet has now been built off the A5 coupe body style and the "S" variant is marketed under the Audi S5 nameplate.
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Common 2021 Audi S4 problems
The Audi S4, a high-performance variant of the Audi A4, has been praised for its excellent interior, great ride quality, and lovable steering and handling. However, it is not without its common problems, which can be categorized into engine, transmission, and brake issues.
Engine issues are one of the most frequently reported problems with the Audi S4. Some owners have reported engine misfires, which can be caused by various factors such as faulty spark plugs, ignition coils, or camshaft adjusters
. These issues can lead to a decrease in performance and fuel efficiency, as well as an increase in emissions. In some cases, engine misfires can also cause the check engine light to illuminate.
Transmission problems are another common issue with the Audi S4. Some owners have reported hard shifting, particularly between 1st and 2nd gear, as well as between 2nd and 3rd gear. This can be caused by a variety of factors, including a worn-out clutch, a faulty transmission control module, or low transmission fluid levels. In some cases, hard shifting can also cause the car to lunge forward, which can be a safety concern.
Brake issues are also a common problem with the Audi S4. Some owners have reported a spongy brake pedal, which can be caused by a variety of factors such as air in the brake lines, worn-out brake pads, or a faulty brake master cylinder
. This can lead to a decrease in braking performance, which can be a safety concern.
It is important to note that not all Audi S4s will experience these problems, and many owners have reported having positive experiences with the car. However, it is always a good idea to be aware of potential issues and to maintain the car regularly to prevent them from occurring. Additionally, it is always a good idea to consult with a certified Audi mechanic if any issues arise.
Is the Audi S4 a reliable car?
The Audi S4 doesn't have a good reputation when it comes to reliability. RepairPal gave it an underwhelming reliability score of only 2.0 out of 5.0. The S4 is known to have a lot of issues like a failed thermostat, turbocharger failure, engine oil leaks, and premature brake wear, among others.
How many miles do Audi S4 last?
A well maintained AUDI can be expected to last a LONG LONG time, as in twenty or thirty years and three or four hundred thousand miles.
What is the 0 60 time for the 2021 Audi S4?
4.3-seconds
Getting to the good stuff; at the test track, the S4 is basically everything you want in a sport sedan. It launches powerfully, with flawless grip for sprints to 60 in 4.3-seconds.
Is an Audi S4 a fast car?
0-60 MPH Times
Looking at the numbers, the S4 ranks above most competitors in performance. The 0-60 mph time for the Audi S4 in our testing was 4.2 seconds.
Is the Audi S4 reliable?
The Audi S4 doesn't have a good reputation when it comes to reliability. RepairPal gave it an underwhelming reliability score of only 2.0 out of 5.0. The S4 is known to have a lot of issues like a failed thermostat, turbocharger failure, engine oil leaks, and premature brake wear, among others.
How many miles do Audi S4 last?
A well maintained AUDI can be expected to last a LONG LONG time, as in twenty or thirty years and three or four hundred thousand miles.
When was the Audi S4 refreshed?
It doesn't have an "A" in its name, but the S4 is effectively the top Audi A4, as well as the lineup's hottest performance variant. The current generation of the compact sport sedan was new for 2017 and underwent a refresh for 2020.
Is Audi A4 or S4 better?
S4 Horsepower. Whichever model you choose, enjoy responsive power delivery and a smooth and quiet ride. The 2023 Audi A4 delivers 201 horsepower or 261 horsepower, depending on the engine option you choose, while the 2023 Audi S4 equipped with the larger V6 engine produces a mighty 349 horsepower.
2021 Audi S4 car problems categorized by type of issue
After analyzing all complaints sent to the NHTSA and researching popular Audi S4 problems, we found that the most common problems with these 2023 model year vehicles are:
- Unknown or other problems
The graph below shows statistics for all 2021 Audi S4 vehicle components and the number of complaints received.
2021 Audi S4 complaints
The NHTSA has received 1 complaints about various vehicle components related to the 2021 Audi S4.
UNKNOWN OR OTHER PROBLEM
- Date Of Incident: 2023-01-31
- VIN: WAUB4AF46MA
- Components: UNKNOWN OR OTHER
- Summary: 2021 AUDI S4. CONSUMER WRITES IN REGARD TO NHTSA SAFETY RECALL 22V-742. THE CONSUMER IS DISGUSTED AND DISATISFIED WITH THE AUDI SERVICE DEPARTMENT PROCEDURES FOR PERFORMING THE RECALLS.
2021 Audi S4 recalls
The National Highway Traffic Safety Administration (NHTSA) has issued 4 recalls for different components of the 2021 Audi S4.
- Manufacturer: Volkswagen Group of America, Inc.
- Components: BACK OVER PREVENTION:DISPLAY FUNCTION
- Summary: Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2021 Audi A8, RS7, RS6 Avant, RS5 Sportback, RS5 Coupe, Q8, Q7, Q5 Sportback, S4 Sedan, Q5, A7, A6, A6 Allroad, A5 Sportback, A5 Coupe, A5 Cabrioleet, A4 Sedan, A4 Allroad, E-Tron Sportback Quattro, SQ7, S5 Cabriolet, E-Tron Quattro, SQ8, SQ5 Sportback, SQ5, S8, S7, S6 Sedan, S5 Sportback, S5 Coupe, 2022 E-Tron GT, and 2021-2022 RSQ8 vehicles. Due to a software issue, a blank or black screen may be displayed instead of the rearview camera image when the vehicle is placed in reverse gear. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 111, "Rear Visibility."
- Consequence: A blank rearview camera display can reduce the driver's rear visibility, increasing the risk of a crash.
- Remedy: Dealers will update the infotainment unit software, free of charge. Owner notification letters were mailed October 25, 2022. Owners may contact Audi's customer service at 1-800-253-2834. Volkswagen's number for this recall is 91DZ.
- Manufacturer: Volkswagen Group of America, Inc.
- Components: TIRES
- Summary: Volkswagen Group of America, Inc. (Audi) is recalling certain 2019-2021 Audi A5 Sportback, RS5 Coupe, RS5 Sportback, S5 Sportback, 2020-2021 A4 Allroad, A4 Sedan, A5 Cabriolet, A5 Coupe, A6 Allroad, A6 Sedan, A7, A8, Q5, S4 Sedan, S5 Coupe, S5 Cabriolet, S6 Sedan, S7, S8, SQ5, 2021 Q5 Sportback, Q7, Q8, RS6 Avant, RS7, RSQ8, SQ5 Sportback, SQ7, and SQ8 vehicles. The rear axle alignment may not have been inspected after the repairs for Recall 21V-295 (42L1) were performed.
- Consequence: Rear axle misalignment may cause premature or uneven tire wear, increasing the risk of a crash.
- Remedy: Dealers will inspect the rear axle, adjust the alignment as necessary, and replace any prematurely or unevenly worn tires, free of charge. Owner notification letters were mailed March 3, 2022. Owners may contact Audi customer service at 1-800-253-2834. Audi's number for this recall is 42L5.
- Manufacturer: Volkswagen Group of America, Inc.
- Components: SEAT BELTS:REAR/OTHER:RETRACTOR
- Summary: Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2021 Volkswagen ID4, Audi A4 Allroad, A4 Sedan, A5 Cabriolet, A5 Coupe, A5 Sportback, A6 Allroad, A6 Sedan, A7, A8, E-Tron Quattro, E-Tron Sportback Quattro, Q3, Q5, Q5 Sportback, Q7, Q8, RS5 Sportback, RS5 Coupe, RS6 Avant, RS7, RSQ8, S4 Sedan, S5 Cabriolet, S5 Coupe, S5 Sportback, S6 Sedan, S7, S8, SQ5, SQ5 Sportback, SQ7, SQ8, and 2021-2022 S3 Sedan vehicles. The rear seat belt automatic locking retractors may deactivate early, which can prevent the child restraint system from securing properly. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, "Occupant Crash Protection."
- Consequence: An unsecured child restraint system can increase the risk of injury during a crash.
- Remedy: Dealers will inspect, and replace as necessary, the middle-rear seat belt assemblies, free of charge. Owner notification letters were mailed August 27, 2021. Owners may contact Volkswagen customer service at 1-800-893-5298 and Audi customer service at 1-800-253-2834. Volkswagen's numbers for this recall are 69CR (VW) and 69CS (Audi).
- Manufacturer: Volkswagen Group of America, Inc.
- Components: SUSPENSION:REAR:AXLE:NON-POWERED AXLE ASSEMBLY
- Summary: Volkswagen Group of America, Inc. (Audi) is recalling certain 2021 Q7, Q8, Q5 Sportback, SQ5 Sportback, RS6 Avant, RS7, RS Q8, 2020-2021 Audi S6 sedan, Q5, A8, S8, A7, A6 Allroad, A5 Cabriolet, A4 sedan, A4 Allroad, SQ5, S7, A6 sedan, S5 coupe, S4 sedan, S5 Cabriolet, A5 coupe, 2019-2021 RS5 coupe, A5 Sportback, S5 Sportback, RS5 Sportback vehicles. The lock nut on the trailing arm of the rear axle may break due to stress corrosion.
- Consequence: A broken lock nut may misalign the rear axle, causing a loss of control and increasing the risk of a crash.
- Remedy: Dealers will replace the lock nuts and, if necessary, the associated bolts, free of charge. Owner notification letters were mailed June 4, 2021. Owners may contact Audi customer service at 1-800-253-2834. Audi's number for this recall is 42L1.
Negative 2021 Audi S4 car reviews
Positive 2021 Audi S4 car reviews
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Love the S4! The handling, power, digital cockpit, and looks are all amazing. After trying an S4, why would anybody buy an A4?
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The Audi offers a luxurious experience with an engine that growls and becomes more serious when switched to sports mode.
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It's great to hear that you had such a positive experience with your first Audi purchase! The S4 sounds like an amazing car, especially with all the room it provides for someone who is 6'1
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This car delivers everything I wanted in a vehicle, and more. It's perfect for long trips, and even when you're stuck behind a slow driver, you never have to worry about having enough power or space to pass. The comfort level is also top-notch. With a tune, it's almost as fast as the RS3, but with more room for passengers. Overall, it's an excellent choice for anyone looking for a reliable and spacious car.
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I recently switched from Mercedes Benz to Audi, including the SLK, CLK, and C Classes. I was pleasantly surprised by the S4 (2019), which is reassuring when pushed. Compared to Mercedes Benz, the stance is just a little firmer and sportier. I really appreciate the seats, which hold me in place during long trips (my last one was 5400km over 10 days). While the massage function isn't super strong, it was helpful. The Drive Select is also quite useful, with modes that are noticeably different from each other. Dynamic Sport mode is especially fun, although the suspension is very firm. I prefer the suspension set softer, which you can do in the Individual Mode. I haven't had any problems with the vehicle in the 32,000kms I've driven it. This is actually my third A4 (this one is an S4, of course). The only challenge I've had was a crack in a thermostat housing in my last A4, which was fixed in under an hour. My experience has been that Audis are not unreliable. We also have a SQ5 2020 with 33,000 kilometres and a Q3 (quattro) with 15,000 kilometres, and we haven't had any challenges with either of these vehicles. The fuel economy around town isn't great, especially if you want to jump off the line at lights (it does bite). However, over the 5400km trip, it got to 6.7ltrs/100kms but averaged 7.2ltrs/100kms, which was fair. There were many Grey Nomads on the highway with caravans, but the car didn't get caught behind any of them. I'm glad people still flash you if there are police on the road. Overall, it's a great car. I thought about getting an RS model, but this S4 is plenty quick and capable enough.
Additional sources
More sources of information about 2021 Audi S4 problems:
2021 Audi S4 Prestige Longterm : r/AudiS4
May 12, 2023 ... Edit: https://static.nhtsa.gov/odi/tsbs/2020/MC-10175308-0001.pdf the oil filter housing leak problem seems to be common on these cars. Upvote
2021 Audi S4 Problems | Kelley Blue Book
How reliable is the 2021 Audi S4? See the most common repairs performed and learn if your vehicle is at risk for major repairs in the next 12 months.
Recently bought a 2021 S4 and I'm having some transmission ...
Jun 10, 2023 ... Skip to main content Recently bought a 2021 S4 and I'm having some transmission concerns : r/Audi. ...
2021 audi s4 B9.5 engine failure? - AudiWorld Forums
Oct 3, 2023 ... S4 (B9 Platform) Discussion - 2021 audi s4 B9.5 engine failure? - I have a 2021 s4 b9.5 and at 32k mileage I had a engine and turbo ...
B9 S4 reliability concerns/common issues? : r/AudiS4
Jan 31, 2023 ... ... 2021 S4, do it. The rocker arm thing is blown completely out of proportion. I've had zero issues with the car since picking it up almost a ...
Other years of Audi S4
Are you having problems with your 2021 Audi S4?
Guillermo Heathcote 2024-09-20
I owned both a 2014 and 2018 A5 coupé, which I absolutely loved. However, I decided to upgrade to a 2020 S4, and I must say, it lives up to all the positive reviews. The car boasts an impressive amount of power and a luxurious interior. While the sports seats and ride may feel a bit stiff, this is to be expected. However, at highway speeds, the road noise can be quite loud, which is a noticeable difference from my A5. Despite having the upgraded sound system, it's not worth the investment for the S4, as the road noise can still overpower it. While this car is perfect for cruising around town or even the track, it may not be the best option for extended periods on the freeway. Overall, I am confident in my decision to upgrade to the S4 and would highly recommend it to anyone looking for a powerful and luxurious ride.
Anderson Kassulke 2024-06-06
If you're considering buying a sport model from Audi and you're a bit of an Audi enthusiast, it's important to do your research. I personally own a brand new S4 2018 model, and after just one year, in 2019, all four tires had completely worn out and split. As a lady driver who drives carefully, this was a real shock and made me feel quite nervous about driving. What's more, I was never told upfront that S Sport models require a special alignment that costs double due to a camera sensor, which can also cause tires to have a shorter lifespan. When I brought my S4 in for a second recall service, I was told that my tires were split and worn, and that this was a common issue with most S models. They even suggested that I consider getting a regular A model instead. It's frustrating to hear these things, and I've recently heard a lot of bad news about Audi and disappointments from their clients. One person said that their engine light came on just three days after buying their car, while another said that they started hearing strange noises after just a week. And once the 50,000 mile warranty is up, you'll be paying a substantial amount for parts and services. So, it's worth considering alternatives like BMW, Mercedes, or Porsche. Do your research and make an informed decision.
Lewis Jacobson 2024-05-29
I really enjoy how Audis perform on the track, but I have noticed that the S4 can be a bit too heavy, which can lead to some wear and tear on the tires and brakes. Additionally, I have had some trouble finding good service at Audi dealerships in the DC/MD area without getting ripped off.