2014 Fiat 500 1.2L Petrol · DN64 PBV

A chronic pattern of exhaust and brake-related defects defines the mechanical history of this 2014 Fiat 500. The most recent MOT on 11 September 2025 produced two simultaneous entries: a pass with no defects recorded and a failure for exhaust hydrocarbon content exceeding manufacturer-specified limits after the second fast idle test. This is the second exhaust failure on record, following a 2023 advisory for a minor exhaust gas leak that was allowed to remain in service. Combined with the 2022 advisories for pitted and scored front brake discs, fluctuating front brake service performance, and a nearside rear coil spring showing corrosion, the underlying theme is a vehicle with components that have reached a wear threshold typical of its age but have, in several cases, been left to deteriorate between tests. The 2023 failure also recorded a dangerously worn nearside front tyre below 1.6mm of tread and an excessively worn offside front anti-roll bar ball joint, both of which represent safety-critical deterioration rather than minor wear. Mileage accumulation across the recorded tests averages roughly 5,600 miles per year, which is low for a vehicle of this age and points to either light seasonal use or extended periods of standing. There are no large gaps in the annual testing pattern, with tests consistently recorded each year from 2021 through 2025, so the low accumulation is more consistent with genuinely light running than with long-term lay-up. Mechanically, low annual mileage on a small petrol Fiat typically reduces wear on major drivetrain components but allows corrosion to develop on exposed underbody items such as brake discs, coil springs, and exhaust mounting rubbers, and it can promote moisture accumulation in the exhaust system that affects emissions output. The hydrocarbon failure on a low-mileage car is consistent with infrequent use allowing the catalyst and oxygen sensors to operate below optimal temperature during short trips. For a prospective buyer, the immediate priority is to verify the post-failure repair that secured the pass on the same day. Confirm the exhaust system has been replaced or repaired end-to-end, paying particular attention to the front flexible section, catalyst, and lambda sensors, and ensure the work is supported by invoice rather than a simple sealant repair that could mask an internal catalyst failure. On a test drive, listen for any ticking or hissing from under the bonnet at idle that would suggest an exhaust leak around the manifold gasket, and watch for an illuminated engine management light, which would indicate the catalyst or sensor work has not fully resolved the emissions issue. The 2022 brake disc advisories mean the front discs and pads should be inspected for lipping, scored surface finish, and any pulsing through the brake pedal under firm stops from around 30mph. The 2023 anti-roll bar ball joint failure and tyre defects also warrant direct physical inspection. Jack the front of the vehicle and check the offside front anti-roll bar linkage and bush for free play, splitting, or any knocking when the suspension is manually loaded, as these joints can wear rapidly once the protective boot is compromised. Inspect all four tyres for uneven shoulder wear, particularly on the nearside front, which was flagged for dangerous tread depth and edge wear in 2023, as this can indicate tracking misalignment or worn suspension bushes. Finally, with rear coil spring corrosion flagged in 2022, examine the spring seats and shock absorber mounting areas for any flaking paint, surface rust, or cracking, and listen for a clonking over speed humps or rough roads, which would indicate the corrosion has progressed to a point where the spring is no longer seating correctly or the damper mount has deteriorated.