Used car guide

2021 Kia Stonic Connect Mhev: common problems and what to check

What gets flagged at MOT on 2021 Kia Stonic Connect Mhevs, from 700 tests in 2025, plus known faults and what to look at before you buy one.

700MOT tests in 2025
88%pass first time (all 2021 cars: 87%)
6,400typical miles a year
16.3×the usual rate for track rod ends

What stands out

Parts flagged at MOT more often on 2021 Kia Stonic Connect Mhevs than on all cars registered in 2021.

  • Track rod ends16.3× usual
    Kia Stonic Connect Mhev
    4.9% All 2021 cars
    0.3%

    Failed outright at MOT: 0.9%, 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
    Kia Stonic Connect Mhev
    8.6% All 2021 cars
    3.8%

    Failed outright at MOT: 6.3%, against 2.4% 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.

By area

The share of 2021 Kia Stonic Connect Mhev MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

  • Tyres
    15% 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
    6% 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
    2% of testsRough price £10–£80

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

  • Seats and seatbelts
    2% of testsRough price £80–£250

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

Looking at a Kia Stonic Connect Mhev?

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

Other years

YearMOT testsMost flagged
2022551Tyres 13%

Where this comes from: the DVSA's anonymised results for every MOT test in Great Britain in 2025, counting tests of 2021 Kia Stonic Connect Mhevs registered in 2021. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score