France's forgotten master of the comfortable motorway mile
The 406 was Peugeot's mid-size saloon and estate from 1995-2004, competing with the Ford Mondeo and Vauxhall Vectra. Known for its sublime ride comfort and Pininfarina-styled Coupé variant, it appeals to classic French car enthusiasts and budget-conscious buyers who appreciate comfort over image. Survivors are increasingly rare and the Coupé is a rising modern classic.
We track 5 known issues across the Peugeot 406 range, including 3 rated as safety-critical. Knowing which variants and configurations to approach with caution can save you from expensive surprises after purchase.
Found a Peugeot 406? Enter the reg to see which of our 5 known issues apply to that exact car, plus full MOT history and mileage checks.
Phase1 (1995–1999) — Petrol options included the 1.8 16v, 2.0 16v, 3.0 V6, with 1.9 TD, 2.1 TD on the diesel side. Our database flags 4 known issues on this generation, 3 of which are rated as safety-critical. The most significant concern is Subframe mounting point corrosion (£800–£2,000 to address).
Phase2 (1999–2004) — Petrol options included the 1.8 16v, 2.0 16v, 3.0 V6, with 2.0 HDi, 2.2 HDi on the diesel side. Our database flags 5 known issues on this generation, 3 of which are rated as safety-critical. The most significant concern is Subframe mounting point corrosion (£800–£2,000 to address).
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.
Structural 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.
Inspect the wheel arches, sills, jacking points and door bottoms carefully. Press gently on sills to check for soft spots. Look underneath for corrosion on structural components. Check the MOT history for corrosion-related advisories or failures.
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.
Severely 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.
Listen for knocking, clunking or rattling over bumps during the test drive. Inspect the underside for corroded or cracked suspension components. Check the MOT history for suspension-related advisories, which often predict future failures.
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.
Brake 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.
Check brake disc condition for lipping or scoring. Test braking at moderate speed for pulling to one side or vibration through the steering wheel. Review MOT advisories for brake-related items.
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.
Worn 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.
Listen for knocking, clunking or rattling over bumps during the test drive. Inspect the underside for corroded or cracked suspension components. Check the MOT history for suspension-related advisories, which often predict future failures.
The common-rail HDi diesel engines suffer from carbon build-up in the injectors and inlet manifold, particularly affecting the 2.0 HDi and 2.2 HDi variants introduced in Phase 2 models. This is exacerbated by short journeys, poor fuel quality and extended oil change intervals. The high-pressure injection system is sensitive to contamination and carbon deposits can cause rough running, poor fuel economy and eventual injector failure.
Severe carbon build-up can cause complete injector failure requiring replacement of the entire injection system. Individual injector replacement costs £200-400 per injector, with four injectors per engine. Complete system failure can cost £2,000-3,000 to rectify. The car may enter limp mode or become undriveable.
Check for fuel smells around the engine bay and underneath the car. Look for staining or wetness around fuel lines and connections. Injector issues may cause rough running or misfires that are most noticeable at idle.
For the full breakdown of all 5 tracked issues with repair costs, see the Peugeot 406 common problems page.
Based on 29k real DVSA MOT tests, the Peugeot 406 fails more often than average on several items. The biggest outlier is suspension ball joints worn at 227x the fleet average, followed by abs fault (64x).
When viewing a specific car, check its MOT history for recurring advisories in these categories. See the full Peugeot 406 MOT failure breakdown for data at every mileage point.
Routine servicing (oil and filter change every 12k miles) typically costs £80–£120 at an independent garage.
The bigger-ticket items to budget for include timing belt (£350–£500).
See the full Peugeot 406 service schedule for every interval and cost breakdown.
The Peugeot 406 has some well-documented weak points, including 3 safety-critical issues that demand careful checking. The right example, properly maintained, can still be a sound purchase — but cutting corners on the pre-purchase inspection is not advisable. Phase 1 models (1995-1999) with the 2.0 HDi or 1.9 TD are the most reliable due to mechanical simplicity. For the Coupé, later Phase 2 (2003-2004) cars had improved build quality. The 2.0 8V petrol is the most bulletproof engine choice across all years.
Before committing, check the car's full MOT history, verify the service record is complete, and if possible arrange a specialist inspection. Enter any registration into our free report to see the complete picture.
Get Car Wise maintains a database of known mechanical issues for every popular car on UK roads, tracking the faults that owners, specialists and DVSA data reveal.
When you run a report on a specific Peugeot 406, we cross-reference the exact variant, engine and age against our database of 5 known issues. Combined with full MOT history analysis, mileage verification and DVLA data, you get a complete picture before viewing.
Enter the registration for MOT history, mileage verification, known faults for that exact variant, and a Get Car Wise Score.
This guide was compiled from independent expert reviews, DVSA MOT data, specialist workshops and our own database of 5 known Peugeot 406 issues. We are not affiliated with any source listed.