Used 2021 BMW 4 Series for Sale nearDetroit, MI

How much does the 2021 BMW 4 Series cost?

Prices have softened 5.86% compared to this time last year, making it a favorable time to shop this model year.

There are 635 listings available, which gives you a meaningful amount of inventory to compare.

Is the 2021 BMW 4 Series a good car?

Yes — with a 5/5 user rating and an expert rating of 6.83/10, it lands as a strong pick if you want style and tech over pure practicality. The standout strength is Technology at 9/10.

The 2021 BMW 4 Series is described as bigger and more luxurious than before, with a fashion-forward design and a greater reliance on technology for performance. It also offers coupe and convertible body styles, plus rear-wheel drive or optional xDrive all-wheel drive, so you can tailor it to your driving preferences.

The trade-offs are clear: the design is potentially polarizing, a manual transmission is not available, and the back seat is cramped. If you want a premium two-door that feels distinct and you can live with those compromises, it fits that use case well.

35.3% of listings are priced as good or great deals, which suggests there are still some attractive opportunities in the market.

Is the 2021 BMW 4 Series reliable?

Owners rate it 5/5, a strong signal of long-term satisfaction.

The 2021 BMW 4 Series is presented as refined and user friendly, with a strong emphasis on technology and a premium driving experience. Its 2.0-liter turbocharged four-cylinder and 3.0-liter turbocharged inline-six give you two clear powertrain choices, and the six-cylinder adds a 48-volt starter/generator for better fuel efficiency.

BMW also includes a four-year or 50,000-mile warranty, plus four years of free roadside assistance. For used buyers, the main long-term risk is that luxury-car ownership can bring higher repair and upkeep exposure once warranty coverage ends.

What should I look for when buying a used 2021 BMW 4 Series?

Accident-free inventory is solid at 79.2% — always verify the vehicle history report.

You should still run a history report on any car you’re considering, even if it looks clean on paper. Prioritize a pre-purchase inspection, especially if the car has optional performance or technology equipment. Focus on condition details that matter in a luxury coupe or convertible, including interior wear, electronics, and signs of hard use.

Key things to evaluate:

• Trim level: The 430i gives you the core 4 Series experience, while the M440i adds more power and a more performance-oriented setup. The base car already includes standard LED headlights and taillights, front sport seats with 10-way power adjustment and driver’s memory, paddle shifters, and a leather-wrapped sport steering wheel.
• Powertrain: You can choose a 2.0-liter turbocharged four-cylinder with 255 horsepower and 294 pound-feet of torque, or a 3.0-liter turbocharged inline-six with 382 hp and 369 lb-ft of torque. The inline-six also uses a 48-volt starter/generator for better fuel efficiency.
• Safety package: Standard driver-assist features include lane-departure warning, forward-collision warning, automatic emergency braking, blind-spot monitoring, rear cross-traffic alert, automatic high beams, and speed-limit information. Adaptive cruise control requires the Driving Assistance Professional Package.
• Infotainment: The standard setup uses an 8.8-inch touchscreen, while the available Live Cockpit Professional system upgrades to a 10.25-inch central touchscreen and a 12.3-inch digital instrument display. Wireless Apple CarPlay and Android Auto are standard, and wireless phone charging is available.
• Fuel efficiency: The rear-wheel-drive 430i is rated at 29 mpg combined (26 city/34 highway), while the xDrive version is rated at 27 mpg combined (24 city/33 highway).

Which 2021 BMW 4 Series trim should I buy?

The 2021 BMW 4 Series is offered in 2 trim levels: 430i and M440i.

Here's the short version:

• 430i: This is the value play if you want the core 4 Series formula without paying for the extra power of the six-cylinder. It still gives you the standard tech and comfort features, plus the coupe or convertible body style, so it suits you if you care most about style, handling, and a strong feature set.
• M440i: This is the better choice if you want the stronger engine and a more performance-focused setup. It adds the 3.0-liter inline-six and the quicker acceleration that comes with it, so it makes sense if you want the most capable version short of the future M4.

Adaptive cruise control is not standard and requires the Driving Assistance Professional Package.

Is now a good time to buy a used 2021 BMW 4 Series?

This looks like a moderate market for selective buyers, with enough inventory and some pricing softness to create opportunities.

• Deal availability: 35.3% of listings are priced as good or great deals.
• Inventory: There are 635 listings available.
• Price trend: Prices have softened 5.86% compared with last year.
• Clean inventory: 79.2% of listings are accident-free.

If you find a listing below $32,026, that's toward the low end of the year-round range and worth acting on quickly.

What is the 2021 BMW 4 Series's resale value?

The current average of $32,748 sits slightly below last year's $34,784.

That decline suggests the market has already adjusted downward, which can help you buy at a more favorable entry point. For a future seller, it also means you should expect resale value to depend heavily on condition, mileage, and equipment. Well-kept examples with desirable features should hold buyer interest better than neglected ones.

Vehicles with strong owner satisfaction ratings, like this model year's 5/5, tend to retain buyer demand, which supports resale value over time.

Is the 2021 BMW 4 Series safe?

The 2021 BMW 4 Series does not yet have published crash-test ratings from NHTSA or IIHS.

It earns a 6/10 safety score from our experts.

Standard driver-assistance features include lane-departure warning, forward-collision warning, automatic emergency braking, blind-spot monitoring, rear cross-traffic alert, automatic high beams, and speed-limit information. If you want adaptive cruise control, you need the Driving Assistance Professional Package, which also adds steering assist to help keep the car centered in its lane.

Should I buy a 2021 BMW 4 Series or consider a different year?

If you're weighing the 2021 against nearby model years, here's how to think about it:

Choose the 2021 if:

• 35.3% of listings are priced as good or great deals.
• Accident-free inventory is solid at 79.2% — always verify the vehicle history report.
• Price trend: Prices have softened 5.86% compared with last year.
• Owners rate it 5/5 — a strong satisfaction signal.
• It emphasizes style, handling, and impressive technology in a premium two-door package.

Consider the 2022 if:

• At $35,806, the 2022 costs more than the current year's $32,748 average.
• It adds a five-door Gran Coupe body with easier rear-seat access and more cargo utility.

The bottom line: If you want the lower price and the classic coupe or convertible format, the 2021 is the better buy. If you need easier rear-seat access and more everyday practicality, the 2022 is the smarter alternative, though you’ll pay more for it.

These recommendations are based on CarGurus' proprietary market data from September 11, 2026, CarGurus experts' opinions, and generative AI.