Used car guide

1997 BMW Z3: common problems and what to check

What gets flagged at MOT on 1997 BMW Z3s, from 1,538 tests in 2025, plus known faults and what to look at before you buy one.

1,538MOT tests in 2025
67%pass first time (all 1997 cars: 67%)
3,200typical miles a year
2.3×the usual rate for exhaust emissions (catalyst)

What stands out

Parts flagged at MOT more often on 1997 BMW Z3s than on all cars registered in 1997.

  • Exhaust emissions (catalyst)2.3× usual
    BMW Z3
    9.7% All 1997 cars
    4.3%

    Failed outright at MOT: 9.7%, against 4.2% of all 1997 cars. The rest were advisories or minor defects.

    Rough price £175–£900 (catalytic converter) ClickMechanic

    At the viewing: Look for smoke when revving the warm engine and for engine or DPF warning lights.

  • Suspension arm2.7× usual
    BMW Z3
    7.9% All 1997 cars
    2.9%

    Failed outright at MOT: 0.6%, against 0.2% of all 1997 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.

  • Flexible brake hoses1.9× usual
    BMW Z3
    10% All 1997 cars
    5.2%

    Failed outright at MOT: 1.1%, against 1% of all 1997 cars. The rest were advisories or minor defects.

    Rough price £50–£200 our estimate

    At the viewing: Look for cracked or bulging rubber hoses behind the wheels and in the engine bay.

  • Ball joint2× usual
    BMW Z3
    8.5% All 1997 cars
    4.3%

    Failed outright at MOT: 2.7%, against 1.3% of all 1997 cars. The rest were advisories or minor defects.

    Rough price £60–£150 (one joint) ClickMechanic

    At the viewing: Listen for knocking over bumps and check the rubber boots behind the wheels aren't split.

  • Airbag warning light4.2× usual
    BMW Z3
    3.8% All 1997 cars
    0.9%

    Failed outright at MOT: 3.3%, against 0.6% of all 1997 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.

By area

The share of 1997 BMW Z3 MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

  • Suspension
    39% 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.

  • Brakes
    39% 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.

  • Lights and electrics
    25% of testsRough price £10–£80

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

  • 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.

  • Exhaust and emissions
    18% of testsRough price £100–£1,200

    At the viewing: Look for black soot in the tailpipe, listen for blowing from the exhaust and check for engine or DPF warning lights.

  • Oil and fluid leaks
    14% of testsRough price £80–£600

    At the viewing: Look under the engine and on the ground where the car is usually parked for fresh oil or fluid.

Looking at a BMW Z3?

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Other years

YearMOT testsMost flagged
20021,040Brakes 33%
20011,747Brakes 34%
20001,844Brakes 35%
19992,635Suspension 34%
19982,338Brakes 35%

Where this comes from: the DVSA's anonymised results for every MOT test in Great Britain in 2025, counting tests of 1997 BMW Z3s registered in 1997. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score