Fiat Seicento Problems & Known Issues

The steel mounting points where the front subframe attaches to the body shell are prone to severe corrosion on the Seicento, particularly around the rear subframe mounting bushes. The thin steel construction and poor factory rust protection mean these critical structural areas corrode through completely, compromising the attachment of suspension components and steering rack. This is a well-documented failure mode that has led to MOT failures at 61.9 times the national fleet average. Once the mounting point structure is compromised, welded repair is often uneconomical relative to the car's value.

The Seicento suffers from multiple brake system defects that cause it to fail MOT brake efficiency tests at up to 172.8 times the national fleet average. The most common causes are seized brake calipers, corroded brake lines, and uneven pad wear leading to brake imbalance across axles. The small brake components and thin brake lines are particularly susceptible to corrosion in UK conditions. This creates a genuine safety hazard as braking distances become unpredictable and the car may pull severely under braking.

Front suspension components on the Seicento corrode and fail at 69.4 times the national fleet average. The most commonly affected parts are lower wishbone arms, anti-roll bar links, and track rod ends, all of which use thin steel construction with inadequate rust protection. Corrosion typically begins at ball joint boots and spreads to the main component structure. Failed components cause excessive play in the front suspension, affecting steering precision and potentially leading to complete separation of steering or suspension components.

Shock absorbers fail on the Seicento at 51.2 times the national fleet average, typically through seal failure leading to oil leakage. The front MacPherson strut units are particularly prone to seal degradation, while rear shock absorbers often fail due to corrosion of the main body tube. Failed shock absorbers severely compromise ride quality and vehicle stability, particularly during cornering and emergency braking situations.