Used car guide

2018 DS 7 diesel: common problems and MOT failures

What MOT testers find on the diesel DS 7 first registered in 2018 (diesel cars only): we looked at the 1,704 MOTs these cars had during 2023–2025. Plus known faults and what to look at before you buy one.

1,704MOTs of 2018 diesel cars, done in 2023–2025
77%pass first time (all 2018 cars: 83%)
8,400typical miles a year
4.3×the usual rate for sidelights

What goes wrong more than usual on a 2018 DS 7 diesel?

Parts flagged at MOT more often on the 2018 DS 7 diesel than on all cars registered in 2018.

  • Sidelights4.3× usual
    DS 7
    2.6% All 2018 cars
    0.6%

    Failed outright at MOT: 2.4%, against 0.5% of all 2018 cars. The rest were advisories or minor defects.

    Rough price £10–£80 our estimate

    At the viewing: Ask a friend to check every light while you work the switches: indicators, brake lights, fog lights and reversing lights.

Better than most

Tyre condition: 4.4% here, against 13.6% of all 2018 cars.

Common 2018 DS 7 diesel MOT failures and advisories

The share of 2018 DS 7 diesel MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

  • Tyres
    27% of testsRough price £70–£150

    At the viewing: Check the tread on all four tyres, including the inside edges, and look for cracks or bulges.

  • Brakes
    21% of testsRough price £150–£350

    At the viewing: Look for a lip on the disc edges and feel for judder or pulling when braking firmly from about 40mph.

  • Suspension
    9% of testsRough price £120–£400

    At the viewing: Listen for knocks over speed bumps, and look behind each front wheel for a snapped coil spring.

  • Lights and electrics
    7% of testsRough price £10–£80

    At the viewing: Ask a friend to check every light, including brake lights and indicators, while you operate them.

  • Wipers, windscreen and mirrors
    6% of testsRough price £15–£250

    At the viewing: Check for chips in the driver's view, and test the wipers and washers.

  • Seats and seatbelts
    4% of testsRough price £80–£250

    At the viewing: Pull each seatbelt sharply. It should lock, and retract cleanly.

Questions to ask the seller before buying a 2018 DS 7 diesel

Ask before you travel to see it. A seller who knows the car will have answers, and receipts.

  1. Any recent work on the sidelights? (Flagged at MOT 4.3× as often on the 2018 DS 7 diesel as on other cars the same age.)
  2. Can I see the service history and receipts for any big jobs?

Looking at a DS 7?

Check the actual car: its own MOT history, mileage and what to ask the seller. Free, no sign-up.

Other years

Every year of the DS 7 compared

YearMOT testsMost flagged
2025–Too new for MOT data
2024–Too new for MOT data
2023–Too new for MOT data
2022330Tyres 23%
2021789Tyres 26%
20201,378Tyres 28%
20193,893Tyres 26%

Where this comes from: the DVSA's anonymised results for every MOT test done in Great Britain during 2023–2025, counting the MOTs of DS 7 cars first registered in 2018. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score