2018 Audi S5 Reliability ReportCommon Problems, Repair Costs & Expert Verdict
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Quick Facts · 2018 Audi S5
- Has 2 NHTSA recalls on record — the most notable involves the air bags:frontal:passenger side:inflator module.
- The system most likely to surface first: adaptive suspension (s sport package) (major severity).
The 2018 Audi S5 at a glance
- Is the 2018 Audi S5 reliable?
- Autojunket rates the 2018 Audi S5 83/100 (grade B+), categorized as low risk. A potent blend of performance and luxury, the 2018 S5 offers solid reliability for its class, provided you budget for premium care.
- Should I buy a used 2018 Audi S5?
- Autojunket recommends reading the full reliability report before buying a 2018 Audi S5. The 2018 Audi S5 is a genuinely compelling package, offering a fantastic driving experience with a well-built powertrain. It earns a 'BUY WITH CONFIDENCE' rating primarily due to the robustness of its engine and transmission. However, prospective owners must enter with eyes wide open regarding the higher cost of mai…
- Which Audi S5 years are the most reliable?
- Best model years to buy: 2018-2020 (B9 generation). Years to avoid: Avoid earlier B8 generation models (2008-2012) if concerned about higher carbon buildup and supercharger issues; the B9's engine is significantly improved..
- What are the most common problems with the 2018 Audi S5?
- The top failure points on the 2018 Audi S5 are Adaptive Suspension (S Sport Package) (typically around 60,000-90,000 miles), MMI & Electrical System (typically around 40,000-80,000 miles), PCV Valve / Thermostat Housing (typically around 70,000-110,000 miles). Autojunket's full report includes repair-cost ranges and inspection checklists for each.
- At what mileage do problems start on the 2018 Audi S5?
- The first major mileage danger zone for the 2018 Audi S5 is around 30,000. Low Risk Zone — This mileage primarily involves routine maintenance, such as oil changes and tire rotations. Early warning signs of MMI glitches or minor sensor issues may begin to surface.
Every answer is generated from real repair, recall, and ownership data — full breakdown in the report.
Read the full free reportShould You Buy the 2018 Audi S5?
The 2018 Audi S5 is a remarkably capable and generally robust performance coupe, representing a strong choice in the luxury sports segment. While its sophisticated systems demand attentive maintenance and higher parts costs, major powertrain failures are uncommon, making it a confident buy for the informed enthusiast.
The 2018 Audi S5 is a genuinely compelling package, offering a fantastic driving experience with a well-built powertrain. It earns a 'BUY WITH CONFIDENCE' rating primarily due to the robustness of its engine and transmission. However, prospective owners must enter with eyes wide open regarding the higher cost of mai…
Best Model Years
2018-2020 (B9 generation)
Years to Avoid
Avoid earlier B8 generation models (2008-2012) if concerned about higher carbon buildup and supercharger issues; the B9's engine is significantly improved.
Biggest Strengths
- Robust 3.0L TFSI V6 engine (EA839)
- Excellent ZF 8-speed automatic transmission
- Superior interior build quality and technology integration
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Top Risk Areas
The systems that tend to fail first on the 2018 Audi S5, with the typical mileage window when each becomes a concern. Detailed repair-cost ranges and exact what-to-check inspection notes are in the full report.
The optional adaptive dampers can leak or fail, leading to reduced ride quality and poor handling. Replacement units are highly proprietary and expensive.
While advanced, the MMI system can experience glitches, freezing, or connectivity issues. Various sensors (e.g. parking, ABS) can also fail, leading to warning lights.
The PCV (Positive Crankcase Ventilation) valve can fail, leading to oil consumption or engine codes. Thermostat housing leaks are also occasionally reported on the 3.0T engine.
2018 Audi S5 Mileage Danger Zones
The mileage windows when the 2018 Audi S5 most commonly needs attention. Plan ahead, budget accordingly, and inspect before you cross each threshold.
Low Risk Zone
This mileage primarily involves routine maintenance, such as oil changes and tire rotations. Early warning signs of MMI glitches or minor sensor issues may begin to surface.
Maintenance Zone
This interval often coincides with Audi's major service, requiring spark plugs, air filters, and potentially brake fluid flush. It's also where adaptive damper failures might start for some vehicles.
Elevated Risk Zone
More significant wear items, such as control arm bushings or PCV valve, may require attention. Transmission fluid service becomes increasingly critical if not already performed.
High Risk Zone
At this mileage, expect more comprehensive component fatigue. Potential for turbocharger issues (less common on EA839), major electrical component failures, and further suspension wear increases. Budget for potential repairs.
Printed Owner's Guidebook
The 2018 Audi S5 Owner's Guidebook
- Autojunket Reliability Report — AutoScore, risk areas, mileage danger zones
- Maintenance schedule, fluids & capacities, common problems, recalls
- Fillable service log & fuel log — keep it in the glovebox
- 6×9 paperback, 40+ pages · free US shipping
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2018 Audi S5 Ownership Cost Outlook
What it typically costs to keep the 2018 Audi S5 on the road. Full 5-year cost-of-ownership projection and major-failure-risk forecast are in the report.
Annual Maintenance
$800-1,200
Moderate Repairs
$1,000-2,500 occasionally (e.g. PCV, control arms, sensors)
How Long Does the 2018 Audi S5 Last?
Focus on vehicles with comprehensive service records. While a 2018 S5 with 60,000-80,000 miles can still be an excellent purchase, ensure major services have been completed, and be prepared for potential proactive maintenance or component replacements in the near future.
What 2018 Audi S5 Owners Actually Say
What Owners Love
- Effortless power delivery and responsive acceleration
- Luxurious, high-tech interior with premium materials
- Confident handling and all-weather capability with Quattro AWD
- Refined ride quality for a performance car (especially without S Sport suspension)
Common Frustrations
- High cost of routine maintenance and replacement parts
- Firm ride quality, particularly with optional S Sport suspension
- Rear seat space is tight for adults on longer journeys
- MMI system can occasionally be glitchy or slow to respond
Who Should Buy the 2018 Audi S5?
Best For
- Enthusiasts seeking a blend of performance and daily drivability
- Buyers prioritizing interior luxury and advanced technology
- Those who live in regions with varied weather conditions (Quattro AWD)
Not Ideal For
- Budget-conscious buyers focused on minimal running costs
- DIY mechanics without specialized diagnostic tools or Audi-specific knowledge
How the 2018 Audi S5 Compares to Rivals
The 2018 S5 holds its own against its German luxury performance rivals, offering a strong balance of performance, luxury, and respectable reliability. While no German performance car is cheap to maintain, the B9 S5 generally avoids the more widespread critical failures seen in…
More Reliable Than
- Mercedes-AMG C43 (often higher electrical issues and early engine concerns)
- Infiniti Q60 Red Sport (less refined interior, often more dated tech)
- Older generation Audi S5 (B8/B8.5 with supercharger and higher carbon buildup risk)
Comparable To
- BMW 440i xDrive (similar performance, maintenance profile, and luxury)
NHTSA Recalls
2 recalls on record from NHTSA. Check your VIN atnhtsa.gov to see if the repair was performed.
AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE
Volkswagen Group of America, Inc. (Audi) is recalling certain 2018-2019 Audi RS5 Sportback, 2018 S5 Cabriolet, S5 Sportback, S5 Coupe, S4 Sedan, A5 Cabriolet, A5 Sportback, A5 Coupe, and 2017-2018 A4 Sedan and A4 Allroad vehicles. Oxidation on the Passenger Occupant Detection System (PODS) connecting cable may cause the software to misdiagnose a malfunction and disable the passenger air bag.
SEATS
Volkswagen Group of America, Inc. (Audi) is recalling certain 2017-2020 A4 Allroad, A4 Sedan, 2018-2019 RS5 Coupe, 2019 RS5 Sportback, 2018-2020 A5 Cabriolet, A5 Coupe, A5 Sportback, S4 Sedan, S5 Cabriolet, S5 Coupe, and Audi S5 Sportback vehicles. The cable connecting the seat heater to the Passenger Occupant Detection System (PODS) may have a contact fault, causing the software to misdiagnose a malfunction and disable the passenger air bag.
What breaks on the 2018 Audi S5?
Full reliability breakdown — engine, transmission, rust, electrical. With repair costs and mileage danger zones.
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Where the 2018 Audi S5 report beats Carfax + CR
Carfax tells you if it crashed. Consumer Reports rates the whole nameplate. Autojunket tells you what will actually break on this specific year — and how to negotiate it.
Year-specific reliability score
Common problems + repair costs
Mileage danger zone map
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Frequently Asked Questions
2018 Audi S5
7-system breakdown, mileage danger zones, repair cost projections, buyer checklist, and expert verdict.
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Printed Owner's Guidebook
The 2018 Audi S5 Owner's Guidebook
Reliability report · service & fuel logs · 13 chapters · free US shipping
Sell your 2018 Audi S5 for what it's actually worth.
Log every service on your Audi S5. When it's time to sell, hand the buyer a signed PDF — every receipt, mileage-verified, close the deal at your price.
- OSC Transfer PDF — every receipt
- Snap-a-receipt AI log
- Fuel & mileage tracker
- Shareable buyer view link
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