2021 Mercedes-Benz GLB 2.0 GLB220d AMG Line Premium Plus

Overview

• Make: Mercedes-Benz
• Model: GLB
• Trim: AMG Line Premium Plus
• Version: 2.0 GLB220d AMG Line Premium Plus DCT 4WD Euro 6 (s/s) 5dr 8G (187 bhp)
• Year: 2021
• Mileage: 35,546 miles
• Fuel: Diesel
• Body: SUV, 5 doors, 7 seats
• 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 Plus is advertised with 35,546 miles, approximately 11,900 below the typical mileage for its age. The dealer is asking £24,250, which is £2,450 below the AskCar estimate of £26,700. To work out the AskCar estimate, we analyse UK dealer adverts for 841 Mercedes-Benz GLB cars across different ages and specifications. Since we first spotted the advert 43 days ago, the asking price has dropped by £1,200. Its advertised mileage matches the government's MOT record. You can find this car at Car Planet Watford in Rickmansworth. 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

Good value: £2,450 (9%) under the AskCar estimate of £26,700.

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 43 days.

Price history

AskCar first saw this advert on 25 September 2026 at £25,450. Its asking price is now £24,250, £1,200 less. The latest price cut was seen on 2 November 2026.

Price changes recorded:

• 25 September 2026: £25,450
• 9 October 2026: £25,150
• 16 October 2026: £24,850
• 21 October 2026: £24,550
• 2 November 2026: £24,250

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 7 November 2026: valid until 4 April 2027.

It failed its MOT on 4 March 2026 (offside front suspension arm ball joint dust cover no longer prevents the ingress of dirt; nearside front tyre tread depth below requirements of 1.6mm; nearside rear tyre has a lump, caused by separation or partial failure of its structure) and passed 2 days later, on 6 March 2026.

There were no advisories at the latest test.

Mileage at that test: 31,834 miles, which matches the advertised 35,546 miles.

Advertised mileage is about 11,900 miles lower than the median mileage of a 2021 Mercedes-Benz GLB on AskCar.

Similar cars

3 other 2021 Mercedes-Benz GLB AMG Line Premium Plus 2.0 diesel automatic SUVs are for sale at UK dealers, from £19,490 to £24,955, as of 7 November 2026.

The 3 closest to this car in mileage:

• 2021 Mercedes-Benz GLB AMG Line Premium Plus, 2.0 diesel SUV, blue. Mileage: 40,273 miles. Price: £24,955, £705 more than this car. Dealer: Hippo Approved in Blackburn. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-78fb6ddf41ba
• 2021 Mercedes-Benz GLB AMG Line Premium Plus, 2.0 diesel SUV, red. Mileage: 45,672 miles. Price: £22,990, £1,260 less than this car. Dealer: Eastern Western Motor Group Western Mercedes-Benz of Coldstream in Coldstream. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-2a926dca8949
• 2021 Mercedes-Benz GLB AMG Line Premium Plus, 2.0 diesel SUV, black. Mileage: 94,000 miles. Price: £19,490, £4,760 less than this car. Dealer: LVMC in High Ongar. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-5db032f04daf