2015 Audi S4 Safety Report
2015 Audi S4 Safety and Reliability Report
Safety Decision Cockpit for the 2015 Audi S4
This page is the hub for deciding what to inspect next on the 2015 Audi S4. It connects recall campaigns, owner complaint patterns, service bulletins, sibling model years, component issue hubs, and the model buying guide so a shopper or owner can move from a single report into the wider safety graph.
| Signal | Value | What to inspect next |
|---|---|---|
| Recall burden | Moderate (1) | Review campaign numbers, affected components, and dealer remedies below. |
| Owner complaints | Low (1) | Scan complaint narratives for recurring symptoms, mileage, crashes, fires, injuries, and dates. |
| Crash and fire reports | 0 | Treat any crash, fire, injury, or fatality-linked pattern as a priority pre-purchase inspection item. |
| Primary component hub | Engine | Compare engine issues across vehicles. |
| Cleaner nearby model year | 2019 | Compare against the 2019 Audi S4 with 2 complaints and 1 recalls. |
| Riskier nearby model year | 2020 | Check the 2020 Audi S4 before buying across this generation. |
Audi S4 Year-by-Year Comparison
The safest purchase decision usually comes from comparing neighboring model years, not reading a single page in isolation. The table below uses only validated Audi S4 years already present in the cleaned NHTSA dataset, so each comparison links to a real vehicle safety report rather than a generated combination.
| Model Year | Complaints | Recalls | Use case |
|---|---|---|---|
| 2018 Audi S4 | 7 | 2 | Inspect as a potentially higher-complaint year. |
| 2019 Audi S4 | 2 | 1 | Inspect as a potentially higher-complaint year. |
| 2020 Audi S4 | 16 | 3 | Inspect as a potentially higher-complaint year. |
| 2021 Audi S4 | 2 | 4 | Inspect as a potentially higher-complaint year. |
2015 Audi S4 Complaint Theme Map
Complaint counts become more useful when they are grouped into inspection themes. For the 2015 Audi S4, these are the component areas with the clearest NHTSA complaint signals. Use each link to jump from this single vehicle into broader component hubs and make-specific issue pages.
Engine
1 owner complaint mention this component in the current safety profile.
All Engine issues Audi onlyAI Safety Analysis for the 2015 Audi S4
Reliability Score
The 2015 Audi S4 receives a reliability score of 85 out of 100 based on analysis of NHTSA complaint data, recall history, crash reports, and safety ratings. This indicates above-average reliability relative to comparable vehicles.
NHTSA Safety Ratings for the 2015 Audi S4
The National Highway Traffic Safety Administration (NHTSA) evaluates vehicles through controlled crash tests and assigns star ratings from 1 to 5, with 5 being the safest.
Known Issues for the 2015 Audi S4
The following issues have been identified from NHTSA complaint data and owner reports for the 2015 Audi S4:
| Issue | Severity | Frequency | Typical Mileage |
|---|---|---|---|
| R&R Valve/Oil Separator Failure The R&R valve/oil separator unit can fail, mixing oil and coolant, which can lead to engine damage. This issue has been reported at approximately 71,000 miles. |
Medium | Occasional | 30k-60k miles |
| Air Bag Deployment Issues Volkswagen is recalling certain model year 2013-2015 Audi A4 and S4 vehicles due to potential air bag deployment issues. This recall affects the air bag control module. |
Medium | Occasional | N/A miles |
Common Problems Reported by Owners
Based on NHTSA complaint data, the following components account for the majority of reported issues with the 2015 Audi S4:
The R&R valve/oil separator unit can fail, mixing oil and coolant, which can lead to engine damage.
Recall Details for the 2015 Audi S4
The following 1 recall has been issued for the 2015 Audi S4 by NHTSA:
Summary: Volkswagen Group of America, Inc. (Volkswagen) is recalling certain model year 2013-2015 Audi A4 and S4 vehicles manufactured February 16, 2012, to October 21, 2014, and 2013-2015 Audi Allroad vehicles manufactured March 12, 2012, to October 21, 2014. Due to an improper algorithm in the air bag control module, if a crash necessitates deployment of the side air bags, a second impact to the front of the vehicle may not command the front air bags to also deploy.
Consequence: If the front air bags do not deploy in the event of a secondary impact to the front of the vehicle, there is an increased risk of occupant injury.
Remedy: Volkswagen will notify owners, and Audi dealers will update the air bag control unit software, free of charge. The recall began on November 14, 2014. Owners may contact Audi customer service at 1-800-822-2834. Volkswagen's number for this recall is 69K5.
NHTSA Complaint Summaries for the 2015 Audi S4
Below are complaint narratives filed by owners of the 2015 Audi S4 with the National Highway Traffic Safety Administration.
The R&R valve/oil separator unit failed on my 2015 Audi S4 at approximately 71,000 miles. This unit, when fails, can mix the oil and anti-freeze which can seize the engine. I was able to catch the problem before engine failure. Minneapolis Audi repaired the vehicle this week, 1/10/23. There were NO warning indicators except noise. Various media sources have stated that this is a known engine ...
Frequently Asked Questions About the 2015 Audi S4
Has the 2015 AUDI S4 been recalled?
Yes, the 2015 AUDI S4 has 1 recall on record with NHTSA. Each recall addresses a specific safety defect identified by the manufacturer or NHTSA.
How many complaints does the 2015 AUDI S4 have?
The 2015 AUDI S4 has 1 complaint filed with NHTSA. None of the complaints involved crashes. No injuries or deaths have been reported.
What is the safety rating for the 2015 AUDI S4?
The 2015 AUDI S4 received an overall NHTSA safety rating of excellent (5/5). Frontal crash: 5/5. Side crash: 5/5. Rollover: 5/5.
What are the most common problems with the 2015 AUDI S4?
The most commonly reported problems with the 2015 AUDI S4 involve engine (1 complaints).
How many crash reports does the 2015 AUDI S4 have?
There are no crash reports associated with the 2015 AUDI S4 in the NHTSA database.
How many fire reports does the 2015 AUDI S4 have?
There are no fire reports for the 2015 AUDI S4 in the NHTSA database.
Are there any deaths reported for the 2015 AUDI S4?
No deaths have been reported in NHTSA complaints for the 2015 AUDI S4.
How many injuries are reported for the 2015 AUDI S4?
No injuries have been reported in NHTSA complaints for the 2015 AUDI S4.
Should I buy a 2015 AUDI S4?
Based on NHTSA data, the 2015 AUDI S4 is generally recommended. It has 1 complaints, 1 recalls, and a excellent (5/5) safety rating. Always have a pre-purchase inspection done by a qualified mechanic.
What components fail most on the 2015 AUDI S4?
The components with the most failures on the 2015 AUDI S4 are: 1. ENGINE (1 complaints). ENGINE is the single most-reported problem area with 1 complaints.
What should I know before buying a 2015 AUDI S4?
Be aware of potential air bag deployment issues and engine failure with the R&R valve/oil separator unit. Regular maintenance can help prevent these issues. The 2015 AUDI S4 has 1 NHTSA complaints and 1 recalls on record. NHTSA rates it excellent (5/5).
How reliable is the 2015 AUDI S4?
The 2015 AUDI S4 receives a reliability score of 85/100, indicating above-average reliability. This is based on 1 owner complaints, 1 recalls, and 0 crash/fire reports in the NHTSA database. Key known issues include R&R Valve/Oil Separator Failure and Air Bag Deployment Issues.
What are the known issues with the 2015 AUDI S4?
Known issues with the 2015 AUDI S4 include: R&R Valve/Oil Separator Failure, Air Bag Deployment Issues. These are based on patterns found across 1 NHTSA complaints. 1 of these patterns resulted in formal recalls.
What are the potential issues with the 2015 Audi S4?
Potential issues include air bag deployment problems and engine damage from a failed R&R valve/oil separator unit.
How can I prevent engine damage in my 2015 Audi S4?
Regular maintenance, particularly checking the R&R valve/oil separator unit, can help prevent engine damage.
Is the air bag recall applicable to my 2015 Audi S4?
Yes, if your vehicle is a 2013-2015 Audi A4 or S4, it may be affected by the air bag recall.
Buyer Advice
Our recommendation: Be aware of potential air bag deployment issues and engine failure with the R&R valve/oil separator unit. Regular maintenance can help prevent these issues.
NHTSA Data Summary for 2015 Audi S4
This safety report is based on a comprehensive analysis of data from the National Highway Traffic Safety Administration (NHTSA) for the 2015 Audi S4. The data includes 1 consumer complaints filed by vehicle owners, 1 manufacturer-initiated safety recalls, and safety rating assessments associated with this vehicle.
The NHTSA has assigned the 2015 Audi S4 an overall safety rating of 5 out of 5 stars, with a frontal crash rating of 5 stars, a side crash rating of 5 stars, and a rollover rating of 5 stars. These ratings are determined through controlled crash testing conducted by the NHTSA.
All data presented in this report is sourced from public NHTSA databases. Our AI analysis identifies patterns across complaint narratives, correlates them with recall history, and produces the safety assessment above. This analysis is updated as new complaints and recalls are filed with the NHTSA.
Consumers are encouraged to report vehicle safety problems to the NHTSA at nhtsa.gov. If your vehicle is subject to a recall, contact your dealer to schedule the free repair.
Disclaimer: This analysis is AI-generated from NHTSA public data and does not constitute professional automotive or safety advice. Always verify recall status at NHTSA.gov and consult a qualified mechanic.
Analysis last updated: 2026-05-13