Is the 2015 Audi S4 reliable?

Based on NHTSA owner complaints and recalls, the 2015 Audi S4 has a complaint index of 7, the lowest of all 16 model years with data, with only 1 complaint filed.

What problems does the 2015 Audi S4 have?

NHTSA shows just 1 complaint for the 2015 Audi S4, involving the engine's R&R valve/oil separator unit, which owners say can allow oil and coolant to mix if it fails.

Does the 2015 Audi S4 have any recalls?

Yes, NHTSA lists 1 recall (campaign 14V667000) covering airbag control unit software on certain 2013-2015 Audi A4, S4, and Allroad vehicles. It is not a do-not-drive recall.

How does the 2015 Audi S4 compare to other S4 years?

The 2015 model has a complaint index of 7, far below years like 2010 (complaint index 100, Avoid) and 2005 (complaint index 93, Avoid), making it one of the lowest-complaint years in the lineup.

What is the fuel economy of the 2015 Audi S4?

EPA rates the 2015 Audi S4 at 20.5 mpg combined (17.5 city / 27 highway), with an estimated annual fuel cost of $3,900.

2015 Audi S4 Reliability Data: Problems & Recalls

No verdict The 2015 Audi S4 has a complaint index of 7, the lowest among the 16 model years with data, ranking 15th worst (meaning it's among the least-complained-about years). NHTSA lists 1 complaint and 1 recall for airbag software, with no crashes, fires, or injuries reported.

Based on NHTSA complaints per model-year, not a reliability rating. Methodology

YearToAvoid Scorecard

Complaint Index: 7/100; #15 of 16 S4 years
Verdict: No verdict; vs. other years of this model
Complaints: 1; unique NHTSA reports
Recalls: 1; distinct NHTSA campaigns
Crashes: 0; reported in complaints
Fires: 0
Injuries: 0
Top issue: Engine
Best nearby year: 2014; rated Good

NHTSA overall rating: 5 / 5 ★
EPA combined MPG: 20.5; 17.5 city / 27 hwy
Injuries / deaths: 0 / 0

2015 Audi S4 recalls

1 NHTSA recall campaign list this model year.

NHTSA 14V667000Oct 24, 2014Airbags101,938 vehicles
Air bags
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.
Risk: 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.

2015 Audi S4 fuel economy and fuel cost

City: 17.5 MPG
Highway: 27 MPG
Combined: 20.5 MPG
Annual fuel cost (EPA): $3,900; 15,000 mi/yr
Fuel: Premium
Current regular gas: $4.32/gal; national avg.

EPA figures; median across configurations of this model year. Estimate your own cost with the fuel cost calculator.

2015 compared with other S4 years

Complaint Index: 0 = fewest issues, 100 = most, relative to other years of this model. Avoid Caution Good Best

Year	Verdict	Index	Complaints	Recalls	MPG
2013	Avoid	80	33	1	20.5
2014	Good	47	17	1	20.5
2015	No verdict	7	1	1	20.5
2018	Good	40	7	2	24
2019	No verdict	20	2	1	24

All Audi S4 years: best and worst →

Frequently asked questions

Is the 2015 Audi S4 reliable?: Based on NHTSA owner complaints and recalls, the 2015 Audi S4 has a complaint index of 7, the lowest of all 16 model years with data, with only 1 complaint filed.
What problems does the 2015 Audi S4 have?: NHTSA shows just 1 complaint for the 2015 Audi S4, involving the engine's R&R valve/oil separator unit, which owners say can allow oil and coolant to mix if it fails.
Does the 2015 Audi S4 have any recalls?: Yes, NHTSA lists 1 recall (campaign 14V667000) covering airbag control unit software on certain 2013-2015 Audi A4, S4, and Allroad vehicles. It is not a do-not-drive recall.
How does the 2015 Audi S4 compare to other S4 years?: The 2015 model has a complaint index of 7, far below years like 2010 (complaint index 100, Avoid) and 2005 (complaint index 93, Avoid), making it one of the lowest-complaint years in the lineup.
What is the fuel economy of the 2015 Audi S4?: EPA rates the 2015 Audi S4 at 20.5 mpg combined (17.5 city / 27 highway), with an estimated annual fuel cost of $3,900.