Used car guide

2004 Peugeot 406: common problems and what to check

What gets flagged at MOT on 2004 Peugeot 406s, from 144 tests in 2025, plus known faults and what to look at before you buy one.

Small sample: only 144 of these were MOT tested in 2025, so treat the percentages as rough. The known faults below don't depend on it.

144MOT tests in 2025
57%pass first time (all 2004 cars: 58%)
6,400typical miles a year
54%had suspension flagged

What gets flagged at MOT

The share of 2004 Peugeot 406 MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

  • Suspension
    54% 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
    43% 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
    38% 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
    30% 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
    18% 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.

  • Exhaust and emissions
    15% 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.

Looking at a Peugeot 406?

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Other years

YearMOT testsMost flagged
2003500Suspension 51%
2002486Suspension 45%
2001457Suspension 50%
2000329Suspension 51%
1999195Suspension 42%
1998196Brakes 46%

Where this comes from: the DVSA's anonymised results for every MOT test in Great Britain in 2025, counting tests of 2004 Peugeot 406s registered in 2004. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score