2021 Mercedes-Benz GLB 1.3 GLB200 AMG Line

Overview

• Make: Mercedes-Benz
• Model: GLB
• Trim: AMG Line
• Version: 1.3 GLB200 AMG Line DCT FWD Euro 6 (s/s) 5dr 7G (161 bhp)
• Year: 2021
• Mileage: 59,293 miles
• Fuel: Petrol
• Body: SUV, 5 doors, 7 seats
• Engine: 1.3 litres, 161 bhp
• Gearbox: Automatic (DCT)
• Drive: Front-wheel drive
• Colour: White
• CO2: 163 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Mercedes-Benz GLB AMG Line is advertised with 59,293 miles, approximately 11,900 above the typical mileage for its age. The dealer is asking £18,186, which is £1,274 below the AskCar estimate of £19,460. To work out the AskCar estimate, we analyse UK dealer adverts for 841 Mercedes-Benz GLB cars across different ages and specifications. The asking price is now £14 lower than when we first recorded the advert 2 days ago. Its advertised mileage matches the government's MOT record. The seller is Quality Part X Dunstable, based in Dunstable. 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: £1,274 (6%) under the AskCar estimate of £19,460.

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 1.3 petrol engine is typically advertised at £21,000: the median of the 52 for sale on AskCar, as of 7 November 2026.

Time on sale

AskCar first saw this 2021 Mercedes-Benz GLB advertised 2 days ago. 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 4 October 2026.

Price history

AskCar first saw this advert on 5 November 2026 at £18,200. Its asking price is now £18,186, £14 less. The latest price cut was seen on 6 November 2026.

Price changes recorded:

• 5 November 2026: £18,200
• 6 November 2026: £18,186

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 7 November 2026: valid until 13 June 2027.

It has had 3 MOTs. The latest, on 12 June 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 53,533 miles, which matches the advertised 59,293 miles.

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

Similar cars

25 other 2021 Mercedes-Benz GLB AMG Line 1.3 petrol automatic SUVs are for sale at UK dealers, from £15,795 to £22,595, as of 7 November 2026.

The 3 closest to this car in mileage:

• 2021 Mercedes-Benz GLB AMG Line, 1.3 petrol SUV, black. Mileage: 62,621 miles. Price: £18,110, £76 less than this car. Dealer: Big Motoring World Enfield in Enfield. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-d5e073fadbeb
• 2021 Mercedes-Benz GLB AMG Line, 1.3 petrol SUV, grey. Mileage: 65,560 miles. Price: £18,495, £309 more than this car. Dealer: Motoroo in Basildon. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-0171ad620b6e
• 2021 Mercedes-Benz GLB AMG Line, 1.3 petrol SUV, grey. Mileage: 52,794 miles. Price: £18,990, £804 more than this car. Dealer: Big Motoring World Blue Bell Hill in Blue Bell Hill. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-c3d8cffef8fa

• The nearest: 2021 Mercedes-Benz GLB AMG Line, 1.3 petrol SUV, white, 17 miles from this car. Mileage: 46,841 miles. Price: £18,990, £804 more than this car. Dealer: Endeavour Omoda & Jaecoo Watford in Watford. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-ff9163a6be21