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The 2021 Audi A4 delivers exceptional luxury sedan performance with its refined 261-horsepower turbocharged 2.0-liter engine that achieves 27 mpg combined fuel economy. Originally starting at $41,945 for the Premium trim, this German-engineered masterpiece now commands $18,000 to $32,000 in today’s used market. The 2021 model year introduced significant technological advancement including 12-volt mild hybrid system, standard quattro all-wheel drive, and enhanced safety features that earned IIHS Top Safety Pick recognition. Consumer testing shows 28.7 mpg real-world fuel economy with excellent 0-60 mph acceleration in 4.8 seconds. With 273 lb-ft of torque available from just 1,600 RPM and Audi’s advanced Virtual Cockpit technology, the A4 combines luxury refinement with engaging driving dynamics that define modern German automotive excellence.
What makes the 2021 Audi A4 exceptional in its class?
The 2021 Audi A4 represents evolutionary perfection of Audi’s B9 generation platform. This model year brought game-changing mild hybrid technology while maintaining the build quality that earned industry acclaim.
Car and Driver praised the A4 as “easy to like and hard to fault” with its handsome styling, excellent build quality, and comprehensive feature list. This wasn’t just automotive journalism hyperbole. The 2021 A4 delivered measurable improvements across all performance metrics.
Revolutionary mild hybrid integration
The most significant upgrade was 12-volt mild hybrid system integration that enhanced both performance and efficiency. Advanced electrical architecture reduced traditional turbo lag while improving fuel economy figures.
Major 2021 technological enhancements:
- 12-volt mild hybrid system standard across all models
- Enhanced quattro all-wheel drive system with improved torque distribution
- Upgraded infotainment with wireless Apple CarPlay integration
- Advanced driver assistance systems with improved sensor accuracy
- Refined suspension tuning balancing comfort and performance
The cabin received meaningful technology updates including improved materials and enhanced connectivity features. Every surface demonstrates Audi’s commitment to luxury craftsmanship that rivals more expensive German competitors.
Actionable takeaways:
- 2021 offers peak mild hybrid technology integration
- Enhanced connectivity systems eliminate aftermarket upgrades
- Improved efficiency addresses environmental concerns effectively
How much does a 2021 Audi A4 cost in today’s market?
The 2021 A4 pricing structure offered distinct trim levels targeting different luxury preferences and performance requirements across multiple markets.
| Trim Level | Original MSRP | Current Used Range | Engine Power | Vietnam Pricing (VND) | Key Standard Features | Best For |
|---|---|---|---|---|---|---|
| Premium 40 TFSI | $37,900 | $18,000 – $24,000 | 201 hp | 950 million | LED headlights, leather seats, Apple CarPlay | Entry luxury buyers |
| Premium Plus 40 TFSI | $41,000 | $21,000 – $27,000 | 201 hp | 980 million | Virtual Cockpit, premium audio, advanced safety | Technology enthusiasts |
| Premium 45 TFSI | $41,945 | $22,000 – $28,000 | 261 hp | 1,017 million | Higher performance, quattro standard | Performance buyers |
| Premium Plus 45 TFSI | $45,000 | $25,000 – $30,000 | 261 hp | 1,024 million | All features, maximum performance | Luxury maximalists |
| Prestige 45 TFSI | $49,500 | $28,000 – $32,000 | 261 hp | 1,047 million | Top-tier luxury, premium materials | Ultimate luxury buyers |
Current used market analysis
Based on July 2025 market data, the 2021 A4 offers exceptional value proposition in today’s used luxury market. Depreciation has created significant opportunities for buyers seeking German luxury at accessible prices.
Market factors affecting current pricing:
- Mileage premium: Low-mileage examples under 30,000 miles command 25-30% premium
- Trim optimization: Premium Plus 45 TFSI offers best feature-to-price ratio
- Condition multiplier: Excellent condition certified pre-owned adds $4,000-5,000 value
- Service documentation: Complete maintenance records increase resale value 20-25%
The optimal purchase target appears to be Premium Plus 45 TFSI models with 40,000-60,000 miles, offering advanced technology and maximum performance without Prestige pricing premiums.
Regional market variations:
- Northern markets: Quattro models command $3,000-4,000 premium due to weather demands
- Southern regions: Base models offer better value proposition
- International markets: Vietnam pricing reflects import duties and luxury taxes
What engine technology powers the 2021 A4’s performance?
Every 2021 A4 features Audi’s sophisticated 2.0-liter TFSI turbocharged four-cylinder engine available in two distinct power configurations with revolutionary mild hybrid integration.
| Engine Specification | 40 TFSI Configuration | 45 TFSI Configuration | Performance Advantage |
|---|---|---|---|
| Engine Type | 2.0L TFSI Turbo I4 + 12V Mild Hybrid | 2.0L TFSI Turbo I4 + 12V Mild Hybrid | Advanced direct injection with electric assist |
| Horsepower | 201 @ 4,200-6,000 RPM | 261 @ 6,500 RPM | Strong acceleration across rev range |
| Torque | 236 lb-ft @ 1,450-4,200 RPM | 273 lb-ft @ 1,600 RPM | Exceptional low-end pulling power |
| 0-60 mph Time | 6.3 seconds | 4.8 seconds | Sports sedan performance capability |
| Top Speed | 130 mph (governed) | 130 mph (governed) | Electronically limited for safety |
| Mild Hybrid System | 12V belt-starter generator | 12V belt-starter generator | Improved efficiency and performance |
Advanced mild hybrid technology breakdown
The 12-volt mild hybrid system provides precision electric assistance that optimizes combustion efficiency across all operating conditions. Peak torque availability from just 1,450 RPM makes both A4 configurations feel incredibly responsive during real-world driving scenarios.
Key technological innovations:
- Belt-starter generator enables seamless start-stop functionality
- Electric torque fill eliminates traditional turbo lag completely
- Regenerative braking recovers energy during deceleration phases
- Advanced engine management optimizes fuel delivery precisely
This engine produces 100.5-130.5 horsepower per liter depending on configuration, demonstrating Audi’s engineering excellence in extracting maximum performance from compact displacement.
Performance characteristics analysis:
- Immediate throttle responseeliminates traditional turbo lag completely
- Linear power deliverythroughout the rev range enhances drivability
- Refined operationwith minimal noise, vibration, harshness intrusion
- Strong mid-range torqueideal for highway overtaking maneuvers
Actionable takeaways:
- Mild hybrid technology significantly improves efficiency without performance compromise
- Premium fuel requirement ensures optimal performance and engine longevity
- Regular maintenance every 10,000 miles maintains peak reliability standards
How does the 2021 A4’s transmission perform?
The 2021 A4 came standard with Audi’s advanced 7-speed S tronic dual-clutch automatic transmission across all trim levels. This sophisticated system delivers rapid shifts and responsive performance characteristics.
Dual-clutch technology advantages
The S tronic system eliminates power interruption typical of conventional automatics through innovative engineering. Two separate clutches manage odd and even gears independently, enabling instantaneous gear changes under all driving conditions.
Transmission performance benefits:
- Lightning-fast gear changes during acceleration phases
- Manual mode with steering wheel paddle shifters for driver control
- Adaptive shift patterns automatically adjust to individual driving styles
- Launch control functionality for optimal standing start acceleration
- Smooth operation during city driving eliminates jerky behavior
Drivetrain configuration excellence
Quattro all-wheel drive comes standard across all 2021 A4 models, eliminating the choice between drive systems. The quattro system provides superior traction and enhanced driving dynamics year-round.
Quattro system operational advantages:
- 40/60 front/rear torque distributionunder normal driving conditions
- Instant adjustment to changing road surface conditions automatically
- Enhanced cornering stability through intelligent torque vectoring
- Superior capability during adverse weather conditions significantly
The drive select system allows comprehensive customization of throttle response, transmission behavior, and steering weight through multiple selectable driving modes.
Available driving mode configurations:
- Comfort: Optimized for daily driving comfort and maximum fuel economy
- Auto: Automatically adjusts all parameters to match driving conditions
- Dynamic: Sporty settings for enthusiastic driving experiences
- Individual: Custom configuration of all vehicle parameters precisely
Actionable takeaways:
- Dual-clutch technology provides sports car-like shift responsiveness
- Standard quattro all-wheel drive eliminates weather-related concerns
- Drive select customization significantly enhances overall driving experience
What technology features define the 2021 A4?
The 2021 A4’s technology systems represented cutting-edge automotive capability that remains competitive against newer luxury sedans today. Audi’s MMI interface provides intuitive control without overwhelming complexity.
Infotainment and connectivity systems
Standard equipment includes a crisp 10.1-inch MMI touchscreen display with comprehensive smartphone integration. Wireless Apple CarPlay came standard across all trim levels, eliminating expensive option package requirements.
Core technology feature lineup:
- MMI touch infotainment with high-resolution color touchscreen display
- Wireless Apple CarPlay and Android Auto integration standard equipment
- Bluetooth connectivity with hands-free calling and audio streaming
- SiriusXM satellite radio with complimentary trial subscription
- Dual-zone automatic climate control with precision temperature management
Virtual Cockpit system implementation
The available 12.3-inch Virtual Cockpit replaces traditional analog gauges with a fully customizable digital display system. Drivers can configure screen layouts to emphasize navigation, audio, or performance information dynamically.
Virtual Cockpit advanced capabilities:
- Full-screen Google Earth navigation mapping with real-time traffic
- Customizable performance and efficiency displays with multiple layouts
- Audio system visualization with album artwork and track information
- Phone and communication integration with message display
- Trip computer and real-time vehicle monitoring comprehensive data
Advanced driver assistance integration
Premium Plus and Prestige trims included sophisticated safety technologies that preview autonomous driving capabilities effectively.
Available safety system portfolio:
- Audi pre sense basic collision preparation with automatic braking
- Audi Side Assist blind spot monitoring with rear traffic alert
- Active Lane Assist with steering intervention capability
- Traffic sign recognition with speed limit display functionality
- Adaptive cruise control with stop-and-go traffic capability
Actionable takeaways:
- Standard smartphone integration eliminates aftermarket solution requirements
- Virtual Cockpit upgrade justifies Premium Plus trim consideration
- Advanced safety features may reduce insurance premium costs significantly
How reliable is the 2021 Audi A4 for long-term ownership?
The 2021 A4 received solid reliability ratings that represent continued improvement over previous Audi generations. What Car awarded an 86.6% reliability score, placing it competitively within the luxury sedan segment.
Reliability performance compared to competitors
The 86.6% What Car score places the 2021 A4 ahead of Mercedes C-Class and Alfa Romeo Giulia but behind BMW 3 Series and Volvo V60 competitors. This represents steady improvement over earlier Audi reliability concerns.
Competitive reliability ranking context:
- Above average: BMW 3 Series, Volvo V60, Genesis G70
- Good performance: 2021 Audi A4 (86.6%), Infiniti Q50, Acura TLX
- Below average: Mercedes C-Class, Alfa Romeo Giulia, Cadillac CT4
Common maintenance considerations
Most reported issues affect electrical components and infotainment systems rather than major mechanical systems. These concerns are typically covered under comprehensive warranty protection during early ownership periods.
Reported maintenance attention areas:
- Infotainment systems: Occasional software update requirements for optimal performance
- Electrical components: Rare warning light malfunctions requiring dealer attention
- DSG transmission: Major service required at 40,000 miles (expensive but essential)
- Climate control: Infrequent electronic control module calibration needs
Positive reliability factors supporting ownership:
- Engine and transmissiondemonstrate excellent long-term durability consistently
- Build qualityremains consistently high across all production batches
- Electrical architectureshows improvement over previous generations
- Warranty coverageaddresses virtually all early ownership concerns comprehensively
Actionable takeaways:
- Expect moderate maintenance costs compared to mainstream brands
- DSG service at 40k miles critical for transmission longevity
- Regular software updates prevent most electronic system issues
What are the 2021 A4’s performance capabilities?
The 2021 A4 delivers engaging driving dynamics that expertly balance performance capability with luxury comfort expectations. Acceleration feels stronger than specifications suggest due to excellent torque delivery characteristics and responsive transmission programming.
Acceleration and handling performance metrics
Real-world performance consistently exceeds manufacturer claims thanks to the mild hybrid system’s torque characteristics and sophisticated transmission calibration throughout the rev range.
Verified performance measurements:
- 0-60 mph (45 TFSI): 4.8 seconds with consistent repeatability
- 0-60 mph (40 TFSI): 6.3 seconds with launch control activated
- Quarter-mile: 13.5 seconds @ 102 mph
- Top speed: 130 mph electronically governed for safety
- Braking 60-0: 149 feet with premium tire compounds
Ride quality and comfort characteristics
The multi-link suspension system provides exceptional ride quality while maintaining composed handling characteristics during spirited driving. Cabin noise isolation ranks among the segment’s best performers consistently.
Dynamic driving characteristics analysis:
- Composed corneringwith minimal body roll through tight transitions
- Precise steeringwith appropriate feedback for luxury sedan expectations
- Confident brakingfrom ventilated disc setup with excellent pedal feel
- Quiet cabineven at sustained highway cruising speeds
Suspension tuning philosophy balance:
- Comfort-orientedprimary focus for daily driving scenarios
- Controlled body motionsduring enthusiastic driving sessions
- Effective bump absorptionover deteriorated road surfaces
- Stable high-speed cruisingbehavior on highway stretches
Actionable takeaways:
- Performance satisfies most luxury sedan buyer expectations completely
- Ride quality excellent for daily commuting and long-distance travel
- Handling capability supports enthusiastic weekend driving adventures
How does the 2021 A4 compare against key rivals?
The 2021 A4 competed directly against established luxury sedans including BMW 3 Series, Mercedes-Benz C-Class, and emerging competitors like Genesis G70 and Infiniti Q50.
| Vehicle | Starting Price | Power/Torque | 0-60 mph | MPG Combined | Safety Rating | Key Competitive Advantage |
|---|---|---|---|---|---|---|
| 2021 Audi A4 45 TFSI | $41,945 | 261hp/273lb-ft | 4.8 sec | 27 mpg | IIHS Top Safety Pick | Technology integration excellence |
| BMW 330i | $40,250 | 255hp/295lb-ft | 5.8 sec | 28 mpg | Good | Superior driving dynamics |
| Mercedes C300 | $41,400 | 255hp/273lb-ft | 6.0 sec | 25 mpg | Good | Interior luxury appointments |
| Genesis G70 | $34,900 | 252hp/260lb-ft | 6.1 sec | 25 mpg | IIHS Top Safety Pick+ | Value proposition and warranty |
| Infiniti Q50 | $36,200 | 300hp/295lb-ft | 5.0 sec | 23 mpg | Good | Performance per dollar value |
| Lexus IS 300 | $38,210 | 241hp/258lb-ft | 6.9 sec | 26 mpg | IIHS Top Safety Pick+ | Long-term reliability reputation |
Comprehensive competitive analysis breakdown
The A4 earned recognition as a top-tier luxury sedan choice, balancing performance, efficiency, technology, and safety better than most segment competitors consistently.
A4 competitive strength analysis:
- Technology integrationsuperior to German luxury rivals significantly
- Standard AWDwhile competitors charge premium for similar capability
- Fuel efficiencycompetitive with best-in-class performers
- Safety ratingsmatch or exceed premium competitors
Areas where specific competitors excel:
- BMW 3 Series: Superior driving dynamics and rear-wheel drive character
- Mercedes C-Class: More luxurious interior materials and finish quality
- Genesis G70: Better warranty coverage and initial purchase value
- Infiniti Q50: Higher performance output and acceleration capability
- Lexus IS: Stronger long-term reliability reputation historically
Market positioning competitive insights:
- Best overall balanceof features, performance, and efficiency
- Premium technologywithout overwhelming interface complexity
- Competitive pricingagainst established German luxury rivals
- Strong safety credentialsmaintain family-friendly appeal effectively
Actionable takeaways:
- A4 offers optimal overall package for most luxury sedan buyers
- Consider BMW 3 Series for maximum driving engagement priority
- Genesis G70 appeals to value-conscious luxury buyers
What fuel economy does the 2021 A4 achieve?
The 2021 A4 achieves outstanding fuel economy ratings that make it practical for daily commuting and long-distance touring despite strong performance capabilities across all driving conditions.
EPA-certified fuel economy performance:
- 45 TFSI models: 24 city / 31 highway / 27 combined mpg
- 40 TFSI models: 25 city / 34 highway / 28 combined mpg
- Real-world average: 28.7 mpg based on owner data
Real-world efficiency analysis and expectations
Actual fuel consumption typically matches EPA estimates closely based on owner reporting data. Fuelly.com data shows 28.67 mpg average across multiple vehicles and 201,402 miles of real-world driving.
Range calculation estimates:
- City range: Approximately 400 miles per tank
- Highway range: Up to 530 miles per tank
- Combined range: 450 miles typical range
Efficiency optimization factors:
- Mild hybrid systemprovides electric assist during acceleration phases
- Advanced turbocharger technologymaintains efficiency under varying load conditions
- Direct injectionoptimizes combustion process for maximum fuel economy
- Aerodynamic designreduces highway drag coefficient significantly
Real-world efficiency maximization strategies:
- Eco driving modeselection maximizes fuel economy potential
- Regular maintenanceschedules maintain optimal engine efficiency
- Proper tire pressuremaintenance improves highway fuel economy
- Quality premium fuelensures engine operates at peak efficiency
Annual fuel cost analysis:
- Estimated annual cost: $1,700-2,100 based on 12,000 miles annually
- Premium fuel penalty: $250-400 additional cost per year
- Efficiency advantage: Saves $300-500 versus less efficient luxury competitors
Actionable takeaways:
- 27-28 mpg combined excellent performance for luxury sedan segment
- Mild hybrid system provides measurable efficiency improvements
- Efficient highway cruising ideal for commuter-focused buyers
Frequently asked questions
Is the 2021 Audi A4 reliable for long-term ownership?
The 2021 A4 received an86.6% reliability score from What Car, placing it above Mercedes C-Class and Alfa Romeo Giulia competitors but below BMW 3 Series and Volvo V60. Common issues include infotainment software glitches and occasional electrical component malfunctions. However, major mechanical components like the engine and transmission show excellent long-term durability. The critical DSG service at 40,000 miles is expensive but essential for transmission longevity.
What trim level offers the best value for money?
ThePremium Plus 45 TFSI trimprovides optimal feature-to-price balance at $45,000 original MSRP. This configuration includes Virtual Cockpit display, premium audio system, maximum horsepower, and advanced safety technologies without Prestige pricing premiums. Current used market pricing ranges $25,000-30,000, making it attractive for buyers seeking advanced technology and maximum performance without luxury appointment premiums.
How does the 2021 A4 compare to the BMW 3 Series?
The 2021 A4 offersstandard quattro all-wheel driveandsuperior technology integrationcompared to BMW 330i, while the BMW providesmore engaging driving dynamicswith rear-wheel drive character. The A4 accelerates faster (4.8 vs 5.8 seconds 0-60) and includes more standard features at comparable pricing. However, the BMW offers slightly better fuel economy and more precise handling characteristics that appeal to driving enthusiasts specifically.
What are the most common problems with 2021 A4?
The most frequently reported issues includeinfotainment system software glitchesrequiring dealer updates andoccasional electrical component malfunctionssuch as warning light errors. Some owners report persistent problems with automatic gearbox jerky changes requiring expensive repairs outside warranty.Major mechanical problems are relatively rarethanks to improved engineering, but DSG transmission service at 40k miles is mandatory and costly.
Is premium fuel absolutely required for the 2021 A4?
Premium unleaded fuel is strongly recommendedfor optimal performance, efficiency, and engine longevity. The high-compression turbo engine with mild hybrid system is designed specifically for premium fuel, and using regular gasoline can reduce power output, decrease fuel economy, and potentially cause long-term engine damage. The performance and efficiency benefits typically justify additional fuel costs, especially considering the engine’s advanced direct injection and turbocharging systems.
How much should I expect to pay for a used 2021 A4?
Currentused market prices range from $18,000 to $32,000depending on trim level, mileage, and condition factors. Premium 40 TFSI models with moderate mileage typically sell for $20,000-25,000, while Premium Plus 45 TFSI examples command $25,000-30,000. Prestige 45 TFSI models with lower mileage can reach $28,000-32,000. Service history documentation and certified pre-owned status significantly affect pricing premiums.
Does the A4 hold its value well compared to competitors?
The 2021 A4 experiencestypical German luxury sedan depreciationwith current values representing approximately 55-70% of original MSRP after four years. While not exceptional for resale value, the A4 maintains competitive market values compared to BMW 3 Series and Mercedes C-Class models. Strong safety ratings, desirable technology features, and improved reliability help support residual values better than some luxury alternatives.
What’s the difference between 40 TFSI and 45 TFSI models?
The 2021 A4 offered40 TFSI with 201 horsepowerand45 TFSI with 261 horsepowerconfigurations. Both use the same 2.0L turbocharged engine with mild hybrid system, but different tuning levels. The 45 TFSI accelerates significantly faster (4.8 vs 6.3 seconds 0-60) while achieving slightly lower fuel economy. For buyers prioritizing performance, the 45 TFSI represents excellent value for the additional capability.
How expensive is maintenance compared to other luxury brands?
Maintenance costs are moderate for German luxury standardsbut higher than mainstream brands. Annual service typically costs $700-900, while major services reach $1,500-2,000 depending on requirements. The mandatory DSG service at 40,000 miles costs $400-600 but is critical for transmission longevity. Premium parts and specialized service requirements increase ownership expenses, but improved reliability helps offset costs through reduced repair frequency.
Should I buy a 2021 A4 in 2025?
The2021 A4 represents excellent valuefor buyers seeking modern luxury sedan features at depreciated prices. The combination of refined performance, contemporary technology, competitive reliability ratings, and comprehensive safety features makes it attractive against newer alternatives. The mild hybrid technology and standard quattro AWD provide future-proof capability. With proper maintenance schedules, these vehicles should provide many years of satisfying ownership.
I am a senior automotive analyst at Autvex. Expert vehicle evaluations, in-depth reviews, and objective analysis helping readers make informed automotive decisions with years of industry experience.
