2021 Mercedes-Benz GLB 2.0 AMG Line Premium

Overview

• Make: Mercedes-Benz
• Model: GLB
• Trim: AMG Line Premium
• Version: 2.0 AMG Line Premium Auto Euro 6 5dr
• Year: 2021
• Mileage: 53,211 miles
• Fuel: Diesel
• Body: SUV, 5 doors
• Engine: 2.0 litres
• Gearbox: Automatic
• Colour: Black
• CO2: 156 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Mercedes-Benz GLB AMG Line Premium is advertised with 53,211 miles, approximately 6,300 above the typical mileage for its age. Priced at £23,995, it is advertised £1,452 above the AskCar estimate of £22,543. The AskCar estimate uses UK dealer asking prices, including 822 Mercedes-Benz GLB adverts, and accounts for the car’s age, mileage and specification. This car was first seen in our listings data 25 days ago. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Agnew Group Mercedes-Benz Of Portadown, based in Portadown. 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: £1,452 (6%) over the AskCar estimate of £22,543.

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 25 days.

Price history

AskCar first saw this advert on 14 October 2026 at £23,995. 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 12 March 2027.

It has had one MOT, on 13 March 2025, and passed.

There were no advisories at the latest test.

Mileage at that test: 36,771 miles, which matches the advertised 53,211 miles.

Advertised mileage is about 6,300 miles higher 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, white. Mileage: 55,800 miles. Price: £22,699, £1,296 less than this car. Dealer: Lookers Mercedes-Benz of Maidstone in Maidstone. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-9274b08ffd64
• 2021 Mercedes-Benz GLB AMG Line Premium, 2.0 diesel SUV, white. Mileage: 50,486 miles. Price: £21,790, £2,205 less than this car. Dealer: Vantage Toyota York in York. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-d4b064e9ae77
• 2021 Mercedes-Benz GLB AMG Line Premium, 2.0 diesel SUV, black. Mileage: 62,000 miles. Price: £22,950, £1,045 less than this car. Dealer: Auto Q in Belfast. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-a153554a972b