2021 Mercedes-Benz CLS 2.9 CLS400d AMG Line

Overview

• Make: Mercedes-Benz
• Model: CLS
• Trim: AMG Line
• Version: 2.9 400d AMG Line 9G-Tronic 4WD Euro 6 4dr Ngt Ed Pr + (325 bhp)
• Year: 2021
• Mileage: 47,254 miles
• Fuel: Diesel
• Body: Coupe, 4 doors, 5 seats
• Engine: 2.9 litres, 325 bhp
• Gearbox: Automatic (9G-Tronic)
• Drive: Four-wheel drive
• Colour: Grey
• CO2: 191 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Mercedes-Benz CLS AMG Line has covered 47,254 miles. The AskCar estimate for this car is £29,522. It is priced at £28,042, which is £1,480 below that estimate. The AskCar estimate uses UK dealer asking prices, including 313 Mercedes-Benz CLS adverts, and accounts for the car’s age, mileage and specification. This car was first seen in our listings data 26 days ago. Its advertised mileage matches the government's MOT record. The seller is Vertu Mercedes Slough, based in Slough. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 10 November 2026.

How we estimate prices and check cars

Price

Fair price: £1,480 (5%) under the AskCar estimate of £29,522.

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 313 priced Mercedes-Benz CLS adverts across different ages and specifications, as of 10 November 2026.

A 2021 Mercedes-Benz CLS with the 2.9 diesel engine is typically advertised at £30,200: the median of the 12 for sale on AskCar, as of 10 November 2026.

Time on sale

This 2021 Mercedes-Benz CLS has been on sale for at least 26 days.

Price history

AskCar first saw this advert on 15 October 2026 at £27,000. Its asking price is now £28,042, £1,042 more.

Price changes recorded:

• 15 October 2026: £27,000
• 16 October 2026: £28,778
• 17 October 2026: £28,695
• 18 October 2026: £28,812
• 20 October 2026: £28,780
• 21 October 2026: £28,778
• 22 October 2026: £28,542
• 9 November 2026: £28,042

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 10 November 2026: valid until 11 August 2027.

It has had 5 MOTs. The latest, on 6 August 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 46,051 miles, which matches the advertised 47,254 miles.

Advertised mileage is about 1,100 miles higher than the median mileage of a 2021 Mercedes-Benz CLS on AskCar.

Similar cars

1 other 2021 Mercedes-Benz CLS AMG Line 2.9 diesel automatic coupe is for sale at UK dealers, as of 10 November 2026.

The closest to this car in mileage:

• 2021 Mercedes-Benz CLS AMG Line, 2.9 diesel coupe, grey. Mileage: 55,680 miles. Price: £25,699, £2,343 less than this car. Dealer: Fords Of Winsford Car Supermarket in Winsford. AskCar page: https://askcar.co.uk/car/mercedes-benz-cls-2021-2e240eaa5714