Mazda 5 MOT Failures

An analysis of 115,635 real DVSA MOT tests on the Mazda 5 — what fails, how often, and how that compares to every other car on UK roads. Generations covered: CW (2005–2010), CWA (2010–2018).

Where the Mazda 5 fails its MOT

The single biggest MOT failure point on the Mazda 5 is indicator or hazard warning switch does not ope... — this model is 39 times more likely to fail on this item than the average car on UK roads. That makes it a significant weak point for anyone buying or owning this model. Across 115,635 MOT tests, 0.95% of all Mazda 5 tests recorded this as a failure.

Lighting faults are usually straightforward to fix (bulbs, connectors, earth points) but can indicate deeper wiring issues on older cars. Check all lights including fog lamps, number plate lights, and dashboard warning lights.

Other notable weak points include emissions failure (46x the fleet average), indicator or hazard warning switch inoperative (37x the fleet average), brake hoses perished or damaged (22x the fleet average), and suspension pin, bush or joint (19x the fleet average). These ratios compare the Mazda 5's failure rate on each item against the national average for all cars tested — a ratio of 10x means this model fails ten times more often than a typical car.

The failures span 5 categories: Lights & Electrics, Exhaust & Emissions, Brakes, Suspension, Bodywork. If you're inspecting a Mazda 5 before purchase, these are the areas to focus on — and if any have been flagged as advisories on a previous MOT, they're likely to become failures in the near future.

How failures change with mileage

The Mazda 5's weak points shift as the car covers more miles. Understanding these patterns helps you know what to expect — and what to budget for — at each stage of ownership.

Under 60,000 miles

At this mileage, most failures are either design-related or caused by age rather than wear. Components like bushes and drop links may not have been replaced yet, and original-fit parts can deteriorate even on low-mileage cars that spend a lot of time sitting.

For the Mazda 5 specifically, the DVSA data shows the most common failures at this mileage are indicator or hazard warning switch inoperative (37x the average) and suspension component damaged or corroded (34x). subframe bushes or mounts worn (32x) and structural corrosion (22x) also appear frequently.

60,000 to 100,000 miles

This is where routine wear items start to show up. Brake components, tyres, and exhaust parts have done serious work by this point. Cars that have been well serviced will show fewer of these failures — this mileage band is where good maintenance really separates the well-kept from the neglected.

For the Mazda 5 specifically, the DVSA data shows the most common failures at this mileage are brake fluid significantly below minimum mark (54x the average) and indicator or hazard warning switch does not ope... (39x). indicator or hazard warning switch inoperative (28x) and reversing lamp inoperative (21x) also appear frequently.

Over 100,000 miles

High-mileage cars accumulate failures across multiple systems. The key question isn't whether things will need doing — they will — but whether the car has been maintained well enough to keep on top of them. Look for a consistent service history and recent MOT passes with minimal advisories.

For the Mazda 5 specifically, the DVSA data shows the most common failures at this mileage are front or rear fog lamp not securely attached (26x the average) and indicator or hazard warning switch does not ope... (24x). fuel pipe or hose damaged (23x) and brake hoses perished or damaged (22x) also appear frequently.

The shift from indicator or hazard warning switch inoperative at lower mileages to front or rear fog lamp not securely attached at higher mileages is typical — early failures tend to be design or factory-related, while high-mileage failures reflect accumulated mechanical wear. A car that's been well maintained will usually dodge the worst of both.

Known issues beyond the MOT

An MOT only tests roadworthiness at a single point in time — it won't catch developing faults, intermittent problems, or issues that haven't yet reached the failure threshold. These are the issues that Mazda 5 specialists and owners flag most frequently, drawn from manufacturer technical bulletins, workshop data, and verified owner reports.

Structural corrosion compromising vehicle rigidity Dangerous

The Mazda 5 suffers from severe structural corrosion that compromises the rigidity of the vehicle assembly. Affects CW, CWA; typical independent garage repair cost is £2,000–£5,000.

Suspension component damage and corrosion Major

The Mazda 5 has exceptionally high suspension component failure rates, with MOT data showing failures at 48.8x the fleet average. Affects CW, CWA; typical independent garage repair cost is £400–£800.

Lambda sensor and emissions system failure Major

Petrol Mazda 5 models suffer from lambda sensor failures that cause the lambda coefficient to fall outside manufacturer limits, with MOT data showing failures at The issue typically manifests as rough idling, poor fuel economy, and MOT emissions test failures. Affects CW, CWA; typical independent garage repair cost is £200–£400.

Exhaust manifold and gasket leaks

The petrol engines in the Mazda 5 develop exhaust manifold gasket failures and manifold cracks that create induction or exhaust leaks affecting emissions. Affects CW, CWA; typical independent garage repair cost is £300–£600.

For the complete picture — including repair costs across independent, specialist, and dealer garages — see the full Mazda 5 common problems breakdown.

What to check before buying a Mazda 5

Based on the MOT failure data and known issues above, here's what to prioritise when inspecting a Mazda 5:

Lights & Electrics — check for indicator or hazard warning switch does not ope..., indicator or hazard warning switch inoperative. Exhaust & Emissions — check for emissions failure. Brakes — check for brake hoses perished or damaged, brake fluid significantly below minimum mark.

Beyond the MOT items, ask specifically about structural corrosion compromising vehicle rigidity and suspension component damage and corrosion. These won't show up on a standard MOT but can be expensive to fix — repairs start from £2,000. A specialist pre-purchase inspection is worth the investment on this model.

Always check the car's full MOT history for patterns — recurring advisories often become failures within 12 months. And verify the service history to confirm maintenance has been kept up to schedule. Enter any reg into our free car check to see the complete picture.

MOT failure data sourced from DVSA bulk test records via data.gov.uk. Ratios compare this model's failure rate against the national fleet average. Known issues sourced from manufacturer bulletins, specialist workshops, and verified owner reports.