The world's smallest four-seater, Toyota tough
The Toyota iQ is an ultra-compact city car that was the smallest four-seater on sale in the UK from 2009 to 2015. It competes with the Smart ForTwo but offers two extra seats in an almost equally tiny footprint. It appeals to urban drivers who need minimal parking space but occasional rear-seat capability, backed by Toyota's reputation for bulletproof reliability.
We track 5 known issues across the Toyota IQ range, including 1 rated as safety-critical. Knowing which variants and configurations to approach with caution can save you from expensive surprises after purchase.
Found a Toyota IQ? Enter the reg to see which of our 5 known issues apply to that exact car, plus full MOT history and mileage checks.
KGJ10 (2008–2016) — Engine options included the 1.0 VVT-i, 1.0 VVT-i, 1.3 VVT-i. Our database flags 5 known issues on this generation, 1 of which are rated as safety-critical. The most significant concern is Suspension mounting area structural weakness.
MOT data shows this model fails at 10.1x the fleet average for load-bearing structure weakness within 30cm of suspension mounting points. The lightweight construction uses thinner steel sections around suspension pickup points which can crack or corrode, particularly where the rear torsion beam mounts to the body shell. This is a prescribed area under MOT testing rules, meaning structural weakness here results in an immediate dangerous failure.
Structural failure in prescribed areas around suspension mounts can cause sudden loss of wheel control, making the vehicle dangerous to drive. Repair typically requires professional structural welding or body shell reinforcement. In severe cases the vehicle may be beyond economical repair.
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.
MOT data shows this model fails at 22.2x the fleet average for suspension joint dust cover deterioration, with 2,502 recorded failures. The rubber boots protecting ball joints and track rod ends deteriorate rapidly on this model, allowing dirt and moisture ingress that accelerates joint wear. Once the boot splits, the joint typically fails within 6-12 months of continued use.
Split dust covers lead to rapid joint wear and eventual failure. Worn suspension joints cause poor handling, irregular tyre wear, and can fail completely causing loss of steering control. Replace joints promptly once covers are damaged.
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.
MOT data shows this model fails at 8.5x the fleet average for brake hose ferrule corrosion, with 3,879 recorded failures across all mileage bands including very low mileage cars. The metal ferrules where flexible brake hoses connect to brake pipes corrode rapidly, particularly at the rear axle where road salt and moisture accumulate.
Corroded brake hose ferrules can leak brake fluid, leading to partial or complete brake system failure. This is a safety-critical defect requiring immediate repair. Do not drive the vehicle if brake fluid leakage is suspected.
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.
MOT data shows this model fails at 5.8x the fleet average for spring fracture, with failures occurring even on very low mileage cars. The coil springs appear susceptible to stress fractures, particularly on the 1.3-litre variants. Spring failure can occur suddenly and affects vehicle handling and ride height.
A broken coil spring affects vehicle stability, steering precision, and can cause rapid tyre wear. In severe cases, broken spring coils can contact the tyre sidewall causing sudden deflation. Replace failed springs in pairs to maintain handling balance.
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 lightweight construction appears vulnerable to corrosion in load-bearing areas, particularly around the rear suspension mounting points and sill sections.
Structural corrosion reduces crash protection and can make the vehicle unsafe. Extensive body corrosion is typically uneconomical to repair on a car of this value. Professional assessment is essential to determine if the structure remains sound.
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.
For the full breakdown of all 5 tracked issues with repair costs, see the Toyota IQ common problems page.
Based on 93k real DVSA MOT tests, the Toyota IQ fails more often than average on several items. The biggest outlier is headlight fault at 21x the fleet average, followed by anti-roll bar links worn (17x).
When viewing a specific car, check its MOT history for recurring advisories in these categories. See the full Toyota IQ MOT failure breakdown for data at every mileage point.
Routine servicing (oil and filter change every 10k miles) typically costs £80–£120 at an independent garage.
See the full Toyota IQ service schedule for every interval and cost breakdown.
The Toyota IQ has some well-documented weak points, including 1 safety-critical issue 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. 2012-2014 models are the pick of the range, benefiting from production maturity and any early issues being resolved. The 1.0-litre manual is the most reliable combination. Avoid the CVT automatic if possible, as it develops issues earlier than the manual gearbox.
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 Toyota IQ, 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 Toyota IQ issues. We are not affiliated with any source listed.