2021 Mercedes-Benz GLB 2.0 GLB220d AMG Line Premium

Overview

• Make: Mercedes-Benz
• Model: GLB
• Trim: AMG Line Premium
• Version: 2.0 GLB220d AMG Line Premium DCT 4WD Euro 6 (s/s) 5dr 8G (187 bhp)
• Year: 2021
• Mileage: 33,392 miles
• Fuel: Diesel
• Body: SUV, 5 doors
• Engine: 2.0 litres, 187 bhp
• Gearbox: Automatic (DCT)
• Drive: Four-wheel drive
• Colour: Grey
• CO2: 156 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Mercedes-Benz GLB AMG Line Premium is advertised with 33,392 miles, approximately 13,500 below the typical mileage for its age. The dealer is asking £23,900, which is £610 below the AskCar estimate of £24,510. To work out the AskCar estimate, we analyse UK dealer adverts for 822 Mercedes-Benz GLB cars across different ages and specifications. We have tracked this advert today. Its advertised mileage matches the government's MOT record. It is for sale at Car Planet Watford in Rickmansworth. 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: £610 (2%) under the AskCar estimate of £24,510.

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

AskCar first saw this 2021 Mercedes-Benz GLB advertised today. About half of 2021 Mercedes-Benz GLB cars are gone from sale within a month of being advertised: 78 of the 161 first advertised between 8 July 2026 and 5 October 2026.

Price history

AskCar first saw this advert on 8 November 2026 at £23,900. Its asking price has not changed.

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 8 November 2026: valid until 1 March 2027.

It has had 3 MOTs. The latest, on 16 February 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 30,411 miles, which matches the advertised 33,392 miles.

Advertised mileage is about 13,500 miles lower than the median mileage of a 2021 Mercedes-Benz GLB on AskCar.

Similar cars

14 other 2021 Mercedes-Benz GLB AMG Line Premium 2.0 diesel automatic SUVs are for sale at UK dealers, from £19,490 to £24,995, as of 8 November 2026.

The 3 closest to this car in mileage:

• 2021 Mercedes-Benz GLB AMG Line Premium, 2.0 diesel SUV, silver. Mileage: 31,007 miles. Price: £24,995, £1,095 more than this car. Dealer: Simpson Motors in Dunfermline. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-20d7122fdf65
• 2021 Mercedes-Benz GLB AMG Line Premium, 2.0 diesel SUV, blue. Mileage: 41,000 miles. Price: £23,590, £310 less than this car. Dealer: Stratstone Mercedes-Benz of Lakeside in Chafford Hundred and West Thurrock. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-2836aac6f6f1
• 2021 Mercedes-Benz GLB AMG Line Premium, 2.0 diesel SUV, black. Mileage: 41,035 miles. Price: £22,950, £950 less than this car. Dealer: NSA Motor Vehicles in Milton Keynes. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-11cde202d124