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: 69,798 miles
• Fuel: Diesel
• Body: SUV, 5 doors, 7 seats
• Engine: 2.0 litres
• Gearbox: Automatic
• Colour: Red
• CO2: 155 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

At 69,798 miles, this 2021 Mercedes-Benz GLB AMG Line Premium has covered about 22,400 more miles than other 2021 Mercedes-Benz GLB cars. Its asking price of £19,490 is £929 below the AskCar estimate of £20,419. The AskCar estimate uses UK dealer asking prices, including 841 Mercedes-Benz GLB adverts, and accounts for the car’s age, mileage and specification. We first saw this car advertised 106 days ago. Its asking price has since fallen by £2,805. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Group 1 Automotive Mercedes-Benz Of Kings Lynn, based in Kings Lynn. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 7 November 2026.

How we estimate prices and check cars

Price

Fair price: £929 (4%) under the AskCar estimate of £20,419.

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 841 priced Mercedes-Benz GLB adverts across different ages and specifications, as of 7 November 2026.

A 2021 Mercedes-Benz GLB with the 2.0 diesel engine is typically advertised at £22,800: the median of the 27 for sale on AskCar, as of 7 November 2026.

Time on sale

This 2021 Mercedes-Benz GLB has been on sale for at least 106 days.

Price history

AskCar first saw this advert on 24 July 2026 at £22,295. Its asking price is now £19,490, £2,805 less. The latest price cut was seen on 3 November 2026.

Price changes recorded:

• 24 July 2026: £22,295
• 29 July 2026: £21,990
• 31 July 2026: £21,950
• 5 August 2026: £21,795
• 11 August 2026: £21,495
• 18 August 2026: £20,995
• 22 August 2026: £20,795
• 27 August 2026: £20,495
• 1 September 2026: £20,395
• 8 September 2026: £19,995
• 22 September 2026: £19,495
• 25 October 2026: £19,990
• 3 November 2026: £19,490

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 7 November 2026: valid until 25 March 2027.

It has had 4 MOTs. The latest, on 26 March 2026, passed.

Advisories at the latest test: front registration plate deteriorated but not likely to be misread; offside rear inner tyre worn close to legal limit/worn on edge.

Mileage at that test: 65,558 miles, which matches the advertised 69,798 miles.

Advertised mileage is about 22,400 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 £19,886 to £24,995, as of 7 November 2026.

The 3 closest to this car in mileage:

• 2021 Mercedes-Benz GLB AMG Line Premium, 2.0 diesel SUV, white. Mileage: 69,085 miles. Price: £19,940, £450 more than this car. Dealer: Evans Halshaw BYD Rotherham in Rotherham. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-d962abb94c3a
• 2021 Mercedes-Benz GLB AMG Line Premium, 2.0 diesel SUV, black. Mileage: 68,280 miles. Price: £21,200, £1,710 more than this car. Dealer: Sytner Select Swindon in Swindon. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-f069fd0d6254
• 2021 Mercedes-Benz GLB AMG Line Premium, 2.0 diesel SUV, red. Mileage: 64,540 miles. Price: £19,886, £396 more than this car. Dealer: Heritage Honda Gloucester in Gloucester. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-20589ade1fdf

• The nearest: 2021 Mercedes-Benz GLB AMG Line Premium, 2.0 diesel SUV, black, 70 miles from this car. Mileage: 41,035 miles. Price: £22,950, £3,460 more than this car. Dealer: NSA Motor Vehicles in Milton Keynes. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-11cde202d124