Used car guide

2021 Hyundai Tucson diesel: common problems and MOT failures

What MOT testers find on the diesel Hyundai Tucson first registered in 2021 (diesel cars only): we looked at the 4,292 MOTs these cars had during 2023–2025. Plus known faults and what to look at before you buy one.

4,292MOTs of 2021 diesel cars, done in 2023–2025
84%pass first time (all 2021 cars: 87%)
8,800typical miles a year
30×the usual rate for track rod ends

What goes wrong more than usual on a 2021 Hyundai Tucson diesel?

Parts flagged at MOT more often on the 2021 Hyundai Tucson diesel than on all cars registered in 2021.

  • Track rod ends30× usual
    Hyundai Tucson
    6% All 2021 cars
    0.2%

    Failed outright at MOT: 1.4%, against 0.1% of all 2021 cars. The rest were advisories or minor defects.

    Rough price £50–£150 (one end, plus about £30–£50 if it needs a wheel alignment) ClickMechanic

    At the viewing: On a straight road the steering wheel should sit straight. Listen for knocks when turning, and check the steering feels even.

  • Wipers2.3× usual
    Hyundai Tucson
    7.8% All 2021 cars
    3.4%

    Failed outright at MOT: 5.8%, against 2.1% of all 2021 cars. The rest were advisories or minor defects.

    Rough price £15–£60 our estimate

    At the viewing: Test the wipers and washers on every speed.

  • Suspension arm bushes and joints5.4× usual
    Hyundai Tucson
    4.3% All 2021 cars
    0.8%

    Failed outright at MOT: 1.4%, against 0.1% of all 2021 cars. The rest were advisories or minor defects.

    Rough price £120–£180 (one arm) ClickMechanic

    At the viewing: Listen for clunks over bumps and feel for the steering wandering. Worn arm bushes show as cracked rubber near the wheels.

Common 2021 Hyundai Tucson diesel MOT failures and advisories

The share of 2021 Hyundai Tucson diesel MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

  • Tyres
    22% 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
    12% 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.

  • Wipers, windscreen and mirrors
    10% of testsRough price £15–£250

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

  • Suspension
    10% 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.

  • Seats and seatbelts
    3% of testsRough price £80–£250

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

  • Lights and electrics
    3% of testsRough price £10–£80

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

Known faults on the 2021 Hyundai Tucson diesel

Reported by owners, mechanics and buying guides for this model and age. Check which engine the car has, as some apply to one engine only.

  • Warning lights and minor electrical faults

    All engines

    18% of cars in What Car?'s survey had a fault, mostly minor bodywork or electrical, and nearly all were fixed free under warranty.

    At the viewing: Check no warnings stay on and test the electrics, including the boot button.

    Source: What Car?: used Hyundai Tucson (2021 on) reliability

Questions to ask the seller before buying a 2021 Hyundai Tucson 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 track rod ends? (Flagged at MOT 30× as often on the 2021 Hyundai Tucson diesel as on other cars the same age.)
  2. Any recent work on the wipers? (Flagged at MOT 2.3× as often on the 2021 Hyundai Tucson diesel as on other cars the same age.)
  3. Any recent work on the suspension arm bushes and joints? (Flagged at MOT 5.4× as often on the 2021 Hyundai Tucson diesel as on other cars the same age.)
  4. Can I see the service history and receipts for any big jobs?

Looking at a Hyundai Tucson?

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 Hyundai Tucson compared

YearMOT testsMost flagged
2026–Too new for MOT data
2025–Too new for MOT data
2024–Too new for MOT data
20231,408Tyres 13%
202222,805Tyres 20%
202039,219Tyres 27%
201979,696Tyres 29%
201873,961Tyres 30%
201771,334Tyres 29%
201660,562Tyres 30%
201514,350Tyres 30%
2010761Brakes 42%
20091,835Suspension 51%
20081,723Suspension 50%
20072,864Suspension 52%
20063,511Suspension 56%
20053,162Suspension 58%
2004785Suspension 53%

Where this comes from: the DVSA's anonymised results for every MOT test done in Great Britain during 2023–2025, counting the MOTs of Hyundai Tucson cars first registered in 2021. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score