2021 Mercedes-Benz GLB 1.3 GLB200 AMG Line

Overview

• Make: Mercedes-Benz
• Model: GLB
• Trim: AMG Line
• Version: 1.3 AMG Line Auto FWD Euro 6 5dr (160 bhp)
• Year: 2021
• Mileage: 39,797 miles
• Fuel: Petrol
• Body: SUV, 5 doors, 7 seats
• Engine: 1.3 litres, 160 bhp
• Gearbox: Automatic
• Drive: Front-wheel drive
• Colour: Blue
• CO2: 163 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Mercedes-Benz GLB AMG Line is advertised with 39,797 miles, approximately 7,600 below the typical mileage for its age. The AskCar estimate for this car is £20,768. It is priced at £20,698, which is £70 below that estimate. To work out the AskCar estimate, we analyse UK dealer adverts for 841 Mercedes-Benz GLB cars across different ages and specifications. We first saw this car advertised 58 days ago. Its asking price has since fallen by £1,097. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Stratstone Mercedes-Benz of Colchester, based in Colchester. 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: £70 (under 1%) under the AskCar estimate of £20,768.

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

This 2021 Mercedes-Benz GLB has been on sale for at least 58 days.

Price history

AskCar first saw this advert on 10 September 2026 at £21,795. Its asking price is now £20,698, £1,097 less. The latest price cut was seen on 30 October 2026.

Price changes recorded:

• 10 September 2026: £21,795
• 19 September 2026: £21,495
• 3 October 2026: £21,297
• 10 October 2026: £21,195
• 20 October 2026: £20,797
• 30 October 2026: £20,698

Mileage and MOT

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

It has had 4 MOTs. The latest, on 8 September 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 39,813 miles, which matches the advertised 39,797 miles.

Advertised mileage is about 7,600 miles lower 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, white. Mileage: 39,900 miles. Price: £20,495, £203 less than this car. Dealer: Georgesons Car Sales in Liverpool. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-8830c097805a
• 2021 Mercedes-Benz GLB AMG Line, 1.3 petrol SUV, blue. Mileage: 36,960 miles. Price: £20,199, £499 less than this car. Dealer: Fords Of Winsford Car Supermarket in Winsford. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-0cf243a7fa08
• 2021 Mercedes-Benz GLB AMG Line, 1.3 petrol SUV, silver. Mileage: 34,750 miles. Price: £21,999, £1,301 more than this car. Dealer: Team Virtus in Pulborough. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-2bb79b58b21e

• The nearest: 2021 Mercedes-Benz GLB AMG Line, 1.3 petrol SUV, grey, 30 miles from this car. Mileage: 65,560 miles. Price: £18,495, £2,203 less than this car. Dealer: Motoroo in Basildon. AskCar page: https://askcar.co.uk/car/mercedes-benz-glb-2021-0171ad620b6e