2021 Mercedes-Benz GLB 2.0 GLB200d AMG Line

Overview

• Make: Mercedes-Benz
• Model: GLB
• Trim: AMG Line
• Version: 2.0 GLB200d AMG Line DCT FWD Euro 6 (s/s) 5dr 8G (148 bhp)
• Year: 2021
• Mileage: 76,940 miles
• Fuel: Diesel
• Body: SUV, 5 doors, 7 seats
• Engine: 2.0 litres, 148 bhp
• Gearbox: Automatic (DCT)
• Drive: Front-wheel drive
• Colour: Black
• CO2: 148 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Mercedes-Benz GLB AMG Line has covered 76,940 miles, around 30,100 more miles than is typical for its age. The dealer is asking £17,450, which is £484 below the AskCar estimate of £17,934. To work out the AskCar estimate, we analyse UK dealer adverts for 822 Mercedes-Benz GLB cars across different ages and specifications. We first saw this car advertised 22 days ago. Its asking price has since fallen by £250. According to the government's MOT record, its advertised mileage is consistent with the latest test. It is advertised by Car Planet Barnet in New Southgate. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 8 November 2026.

How we estimate prices and check cars

Price

Fair price: £484 (2%) under the AskCar estimate of £17,934.

The AskCar estimate is our expected asking price for this car. It uses UK dealer asking prices, accounting for make, model, trim, version, age, mileage, fuel, gearbox, body type, driven wheels, engine size and power. It is an advertised price, not a confirmed sale price.

It draws on 822 priced Mercedes-Benz GLB adverts across different ages and specifications, as of 8 November 2026.

A 2021 Mercedes-Benz GLB with the 2.0 diesel engine is typically advertised at £23,000: the median of the 27 for sale on AskCar, as of 8 November 2026.

Time on sale

This 2021 Mercedes-Benz GLB has been on sale for at least 22 days.

Price history

AskCar first saw this advert on 17 October 2026 at £17,700. Its asking price is now £17,450, £250 less. The latest price cut was seen on 3 November 2026.

Price changes recorded:

• 17 October 2026: £17,700
• 3 November 2026: £17,450

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 8 November 2026: valid until 14 September 2027.

It has had 4 MOTs. The latest, on 15 September 2026, passed.

Advisories at the latest test: rear tyre slightly damaged/cracking or perishing both.

Mileage at that test: 75,288 miles, which matches the advertised 76,940 miles.

Advertised mileage is about 30,100 miles higher than the median mileage of a 2021 Mercedes-Benz GLB on AskCar.

Similar cars

2 other 2021 Mercedes-Benz GLB AMG Line 2.0 diesel automatic SUVs are for sale at UK dealers, from £20,699 to £23,499, as of 8 November 2026.

The 2 closest to this car in mileage:

• 2021 Mercedes-Benz GLB AMG Line, 2.0 diesel SUV, white. Mileage: 53,873 miles. Price: £20,699, £3,249 more than this car. Dealer: Henson Car Store in Newcastle upon Tyne. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-7b3b2fa923fd
• 2021 Mercedes-Benz GLB AMG Line, 2.0 diesel SUV, white. Mileage: 53,361 miles. Price: £23,499, £6,049 more than this car. Dealer: Stratstone Mercedes-Benz Of Hamilton in Hamilton. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-c3cd6f7d419c