Used car guide

1997 Mercedes-Benz C-Class diesel: common problems and MOT failures

What MOT testers find on the diesel Mercedes-Benz C-Class first registered in 1997 (diesel cars only): we looked at the 288 MOTs these cars had during 2023–2025. Plus known faults and what to look at before you buy one.

Small sample: there were only 288 MOTs of these cars during 2023–2025, so treat the percentages as rough. The known faults below don't depend on it.

288MOTs of 1997 diesel cars, done in 2023–2025
70%pass first time (all 1997 cars: 65%)
5,000typical miles a year
40%had suspension flagged

Common 1997 Mercedes-Benz C-Class diesel MOT failures and advisories

The share of 1997 Mercedes-Benz C-Class diesel MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

  • Suspension
    40% 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
    35% 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
    30% 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
    25% 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.

  • Oil and fluid leaks
    25% 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.

  • Rust and bodywork
    11% 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.

Questions to ask the seller before buying a 1997 Mercedes-Benz C-Class diesel

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

  1. Can I see the service history and receipts for any big jobs?

Looking at a Mercedes-Benz C-Class?

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Other years

Every year of the Mercedes-Benz C-Class compared

YearMOT testsMost flagged
2026–Too new for MOT data
2025–Too new for MOT data
2024–Too new for MOT data
2023380Tyres 16%
20224,795Tyres 26%
202111,663Tyres 27%
202030,441Tyres 29%
201973,990Tyres 29%
201884,961Tyres 30%
2017118,916Tyres 30%
2016110,990Tyres 30%
2015103,655Tyres 30%
201477,294Tyres 31%
201372,996Brakes 31%
201281,468Brakes 39%
201160,864Brakes 39%
201042,612Brakes 39%
200941,744Brakes 41%
200844,156Suspension 42%
200739,195Suspension 48%
200631,275Suspension 55%
200527,259Suspension 57%
200420,438Suspension 57%
200314,253Suspension 53%
20027,932Suspension 48%
20014,263Suspension 47%
20001,993Suspension 41%
19992,498Suspension 36%
19982,759Suspension 38%
19961,272Suspension 37%
1995970Brakes 33%
1994779Suspension 37%
1993–Too few tests

Where this comes from: the DVSA's anonymised results for every MOT test done in Great Britain during 2023–2025, counting the MOTs of Mercedes-Benz C-Class cars first registered in 1997. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score