The overlooked MOT fault
For a Ford Fiesta, the most common MOT failure isn't a complex engine fault or a tricky transmission problem. Instead, national DVSA MOT data shows that a surprising 35% of all defects recorded on Fiestas are in the 'Lighting & electrical' category. This means that for every five Fiestas that fail, nearly two of them do so because of something as seemingly mundane as a headlight bulb or a faulty indicator.
A breakdown of common failure points
While 'Lighting & electrical' issues dominate with a 35% share of total defects, other categories also contribute significantly to the Ford Fiesta's MOT challenges. Suspension faults account for 18% of failures, with tyres following closely at 15%. Other miscellaneous defects make up 13%, and brakes, a critical safety system, are responsible for 12% of recorded problems. Emissions and exhaust issues represent a smaller but still notable 7% of failures. The overall picture reveals that many of the most frequent MOT failures are often accessible components purchasers can check.
Fiesta MOT performance in context
The Ford Fiesta achieves a MOT pass rate of 73.4%, which aligns closely with the market average, indicating it's neither an outlier nor a standout in terms of overall reliability at test time. This rate is derived from over 1.4 million vehicles with MOT history, giving a robust indication of real-world performance. While no vehicle is fail-proof, the data suggests that common-sense checks before an MOT can often pre-empt the most frequent defects.
Understanding the data's limits
These figures, drawn from national DVSA MOT test records, reflect the condition of vehicles at the point of test. An MOT pass rate doesn't guarantee fault-free ownership between tests, nor does it account for regular maintenance schedules. Failures can also cluster based on a vehicle's age, mileage, and how well it has been maintained, rather than being solely attributable to the badge on the bonnet. Our analysis only covers models with sufficient records to provide meaningful insights.
What to check before your Fiesta's MOT
Given that 'Lighting & electrical' issues are the leading cause of MOT failure for the Ford Fiesta, a pre-MOT check should always include all exterior lights, instrument panel warning lights, and the horn. Beyond this, a visual inspection of tyre tread depth and condition, and listening for any unusual suspension noises, can flag common issues. For any specific used Ford Fiesta you are considering, checking its MOT history via the DVLA website will provide a full breakdown of past failures and advisories, offering direct insight into the vehicle's maintenance needs. You can explore more data on the model at our Ford Fiesta MOT reliability hub.