Used car guide

2004 Mazda RX-8: common problems and what to check

What gets flagged at MOT on 2004 Mazda RX-8s, from 434 tests in 2025, plus known faults and what to look at before you buy one.

Small sample: only 434 of these were MOT tested in 2025, so treat the percentages as rough. The known faults below don't depend on it.

434MOT tests in 2025
71%pass first time (all 2004 cars: 58%)
3,200typical miles a year
29%had suspension flagged

What gets flagged at MOT

The share of 2004 Mazda RX-8 MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

  • Suspension
    29% 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
    28% 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
    22% 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
    21% 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.

  • Rust and bodywork
    14% of testsRough price £150–£1,000

    At the viewing: Check the sills, wheel arches and underneath for rust, and look along the panels for uneven gaps or paint.

  • Oil and fluid leaks
    13% 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 Mazda RX-8?

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Other years

YearMOT testsMost flagged
2010104Suspension 26%
2009252Suspension 28%
2008361Suspension 35%
2007505Suspension 37%
2006487Suspension 33%
2005328Suspension 31%

Where this comes from: the DVSA's anonymised results for every MOT test in Great Britain in 2025, counting tests of 2004 Mazda RX-8s registered in 2004. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score