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Peugeot 406 Problems & Known Issues

The most common Peugeot 406 problems ranked by severity — what to watch for, what it costs to fix, and what happens if you ignore it.

Generations

Phase1 — Phase 1
1995–1999
1.8 16v, 2.0 16v, 1.9 TD, 2.1 TD, 3.0 V6
Phase2 — Phase 2
1999–2004
1.8 16v, 2.0 16v, 2.0 HDi, 2.2 HDi, 3.0 V6

Top issues to watch for

The most serious Peugeot 406 problems ranked by severity. We track 5 known issues — here are the ones you need to know about first.

Dangerous
Subframe mounting point corrosion
Phase1, Phase21995–200460k–200k miles
The load-bearing structure around subframe mounting points suffers from aggressive corrosion on 406 models, particularly where the rear subframe attaches to the bodyshell. The problem is exacerbated by poor drainage around the rear suspension turrets and inadequate factory rust protection. This is a structural safety issue that can result in suspension component detachment.
What happens if ignoredStructural failure of subframe mounting points can cause loss of vehicle control and potential accident. MOT failure is certain once corrosion is visible. Repair requires professional bodywork including welding new metal sections and may cost more than the vehicle's value on older examples.
Independent garage
£800–£2,000
Specialist
£1,000–£2,500
Main dealer
£1,500–£3,500
Parts only
£200–£500
Dangerous
Suspension component excessive corrosion
Phase1, Phase21995–200480k–200k miles
Suspension components including wishbones, anti-roll bar links and trailing arms suffer from excessive corrosion on 406 models. MOT data shows failures at 510.8 times the fleet average on high-mileage examples. The steel components were poorly protected from factory and corrosion accelerates once the protective coating is breached. This affects vehicle handling and can lead to component separation.
What happens if ignoredSeverely corroded suspension components can fracture suddenly causing loss of vehicle control. The car will fail MOT inspection and is unsafe to drive once structural integrity is compromised. Component replacement is required and costs escalate on older vehicles where multiple items need renewal.
Independent garage
£200–£600
Specialist
£250–£750
Main dealer
£400–£1,000
Parts only
£100–£300
Dangerous
Brake flexible hose deterioration
Phase1, Phase21995–200460k–180k miles
Flexible brake hoses deteriorate prematurely on 406 models, with MOT data showing failures at 7.7 times the fleet average. The rubber hoses connecting the brake pipes to the brake calipers suffer from age-related perishing and can develop dangerous internal collapse or external cracking. This affects brake performance and can lead to complete brake failure.
What happens if ignoredBrake hose failure can cause complete loss of braking ability or severe brake imbalance leading to loss of control. Internal hose collapse causes reduced braking performance and longer stopping distances. Any brake fluid loss compromises the entire braking system and makes the vehicle dangerous to drive.
Independent garage
£80–£180
Specialist
£100–£220
Main dealer
£150–£300
Parts only
£30–£80
Major
Suspension bushes and joints wear
Phase1, Phase21995–200460k–150k miles
Rubber bushes and ball joints in the suspension system wear prematurely on 406 models. MOT data shows failures at 101.6 times the fleet average, particularly affecting the front wishbone bushes and rear trailing arm bushes. The original rubber compounds deteriorate with age and mileage, causing play in the suspension geometry and affecting handling precision.
What happens if ignoredWorn suspension bushes cause poor handling, increased tyre wear and eventual MOT failure. Ball joint failure can cause wheel detachment and loss of control. Progressive deterioration affects braking stability and cornering precision, making the vehicle unpredictable to drive.
Independent garage
£150–£400
Specialist
£200–£500
Main dealer
£300–£700
Parts only
£50–£150

1 more known issues tracked

Including wear items, electrical niggles, and generation-specific problems. Check a specific car to see which issues apply to its age and mileage.

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MOT failure hotspots

Based on DVSA MOT test data. These are the items where the Peugeot 406 fails at a significantly higher rate than the average car.

Suspension ball joints worn
Suspension · 60-80k miles
MOT failure rate: 227x the fleet average
Sample: 135 tests
ABS fault
Brakes · 100-120k miles
MOT failure rate: 64x the fleet average
Sample: 1,912 tests
Anti-roll bar links worn
Suspension · 100-120k miles
MOT failure rate: 63x the fleet average
Sample: 1,426 tests
Light unit fault
Lights & Electrics · 100-120k miles
MOT failure rate: 45x the fleet average
Sample: 1,772 tests
Emissions failure
Exhaust & Emissions · 100-120k miles
MOT failure rate: 32x the fleet average
Sample: 957 tests
Power steering fault
Steering · 120-150k miles
MOT failure rate: 20x the fleet average
Sample: 203 tests

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Related

Peugeot 406 reliability FAQs

What are the most common problems with the Peugeot 406?

The Peugeot 406 has 5 known issues across 2 severity levels. The most serious are: Subframe mounting point corrosion, Suspension component excessive corrosion, Brake flexible hose deterioration.

Is the Peugeot 406 reliable?

The Peugeot 406 has 3 dangerous and 2 major known issues. Most can be avoided with a thorough pre-purchase check and full service history.

How much does it cost to fix Peugeot 406 problems?

Repair costs range widely. The most significant issue (Subframe mounting point corrosion) costs £800–£2,000 at an independent garage. Minor issues can be under £200. Always get a full inspection before buying.

Which Peugeot 406 generation is most reliable?

The Phase1 (1995–1999) has the fewest dangerous issues (3). However, condition and service history matter more than generation — a well-maintained earlier car can be more reliable than a neglected newer one.