What are the most common problems with the 2021 Audi A8?

The 2021 Audi A8's primary ownership concern is the **Engine Control Module (ECM)**, which can suffer from moisture ingress. Ensure this critical component has been properly inspected and sealed.

How many recalls does the 2021 Audi A8 have?

The 2021 Audi A8 currently has 59 recalls on file. Review the full recall report to see affected components and available remedies.

Is the 2021 Audi A8 a good buy used?

Verdict: High risk. The 2021 Audi A8's primary ownership concern is the **Engine Control Module (ECM)**, which can suffer from moisture ingress. Ensure this critical component has been properly inspected and sealed. Numerous **seat belt recalls**, particularly affecting rear retractors and child restraint systems, have been issued. Verify that all seat belt related campaigns have been completed. While the A8 boasts a powerful 4.0L V8 engine and **all-wheel drive**, its combined MPG is 18, indicating potentially high fuel costs. The vehicle has a high TSB count (271), suggesting Audi has been proactive in addressing potential issues, but it also points to a complex system with numerous minor concerns. NHTSA has not provided overall safety ratings for the 2021 A8, making independent inspection crucial. Always verify service history, open recalls, and maintenance records before purchasing.

What maintenance costs should I expect for the 2021 Audi A8?

Refer to the maintenance cost guide for interval schedules, DIY difficulty ratings, and typical repair cost ranges for the 2021 Audi A8.

2021 Audi A8 Report

Known issues, recalls, running costs, and what to check before you buy.

Updated Jun 2, 2026Daniel Wilson2 Critical Recalls

Overall Score

Our Verdict

High risk

Key Takeaways

The 2021 Audi A8's primary ownership concern is the Engine Control Module (ECM), which can suffer from moisture ingress. Ensure this critical component has been properly inspected and sealed.
Numerous seat belt recalls, particularly affecting rear retractors and child restraint systems, have been issued. Verify that all seat belt related campaigns have been completed.
While the A8 boasts a powerful 4.0L V8 engine and all-wheel drive, its combined MPG is 18, indicating potentially high fuel costs.
The vehicle has a high TSB count (271), suggesting Audi has been proactive in addressing potential issues, but it also points to a complex system with numerous minor concerns.

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Overview

2021 Audi A8

The 2021 Audi A8 offers a sophisticated and powerful luxury sedan experience, blending advanced technology with a potent V8 engine and standard all-wheel drive. However, for the used car shopper, a closer look at its reliability record is essential. With 59 recalls and a significant number of Technical Service Bulletins (TSBs), potential buyers must be aware of recurring issues, particularly concerning the Engine Control Module (ECM) and seat belt systems. While zero complaints were logged, the sheer volume of recalls suggests a complex vehicle with areas requiring diligent attention.

Critical Failure Risk

Moisture ingress into the ECM can cause module failure, leading to engine performance issues or complete shutdown. This is a critical concern identified in recalls.

Early detection can help you avoid a $500-$1,500 repair.

Open Maintenance Analysis →

Safety & Bulletins

Open Recalls59

Service Bulletins0

Full Recall History →

Owner Complaints

No primary complaint themes found.

Detailed Issue Breakdown →

Performance & Efficiency

Fuel Efficiency

Combined

MPG

City

MPG

Highway

MPG

Full Vehicle Specifications ↓

Reliability

Practicality

The score is mainly limited by high fuel consumption.

Buyer Fit

Who This Car Is For

Best for

Discerning buyers prioritizing advanced technology and a refined driving experience.

+2 more buyer-fit notes in the full report

Avoid if

Budget-conscious buyers seeking low-maintenance transportation.

+2 more buyer-fit warnings in the full report

2021 Audi A8 Reliability Analysis

Specs

Vehicle Specs

Fuel Type: Premium
Transmission: Automatic (S8)
Drivetrain: All-Wheel Drive
Body Style: Sedan
EPA Combined MPG: 18

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Most Common Issues

1. Engine Control Module (ECM) Moisture Ingress

Most reported

Usage data observed

2. Rear Seat Belt Retractor Malfunction

Usage data observed

See all common issues in the maintenance guide

First Service Interval

- Oil Change (5W-40 Synthetic) (Parts: 5W-40 Synthetic Oil, Oil Filter) - Tire Rotation and Inspection - Brake System Inspection - Wiper Blade Check

Est. shop cost: $150 - $250

10,000 mi

Unlock the full maintenance guide for every scheduled service interval and cost forecast.

Full pre-purchase inspection checklist

Complete maintenance schedule (5 service intervals)

Repair forecasts with mileage and cost context

Full buyer-fit guidance and who should avoid it

Full specs and trim-level context

59 recall campaign details & remedy notes

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FAQ

Is the 2021 Audi A8 reliable?

The CarFocal Reliability Score for the 2021 Audi A8 is 7.1/10. Reliability score is 7.1/10. NHTSA recalls: 59. Owner complaints: 0.

How practical is the 2021 Audi A8 for daily use?

Practicality score is 5.0/10. The score is mainly limited by high fuel consumption. EPA combined economy is 18 MPG.

What is the overall score for the 2021 Audi A8?

The CarFocal Overall Score for the 2021 Audi A8 is 5.7/10. Overall score is 5.7/10 (Mixed). Confidence 55%. Maintenance 6.8/10. Practicality 5.0/10.

What does it cost to own and maintain a 2021 Audi A8?

Based on Carfocal's data, First listed service: - Oil Change (5W-40 Synthetic) (Parts: 5W-40 Synthetic Oil, Oil Filter) - Tire Rotation and Inspection - Brake System Inspection - Wiper Blade Check at 10,000 miles. Estimated first-year maintenance: $1,000 - $1,800. Repair prediction highlight: Engine Control Module (ECM) (typical at 55,000 miles, estimated cost Min: $500 • Max: $1500).

What engine is in the 2021 Audi A8?

Engine specs list 8 • 4.0.

What transmission does the 2021 Audi A8 use?

According to CarFocal's specs for the 2021 Audi A8, transmission is Automatic (S8). The paired drivetrain is All-Wheel Drive.

Does the 2021 A8 require Premium gas?

Manufacturer fuel recommendation: Premium.

What is the combined EPA MPG for the 2021 Audi A8?

EPA combined estimate is 18 MPG.

What body style is the 2021 Audi A8?

According to CarFocal's specs for the 2021 Audi A8, body style is sedan.

What drivetrain does the 2021 Audi A8 use?

According to CarFocal's specs for the 2021 Audi A8, drivetrain is All-Wheel Drive. Transmission is Automatic (S8).

Are there open safety recalls on the 2021 Audi A8?

This model year has 59 official safety campaigns listed.

Should buyers consider alternatives to the 2021 Audi A8?

Alternatives listed in this guide: 2021 Mercedes-Benz S-Class and 2021 Porsche Panamera.