Ford Fiesta

The Gen3 engines also use sensitive coolant hoses at the expansion tank. Plastic fittings can become brittle and cause coolant loss that quickly leads to overheating.

Symptoms: Coolant level drops without visible leak, temperature warning on the dashboard.

The 1.0 EcoBoost uses a wet timing belt for the oil pump. Incorrect oil (without Ford WSS-M2C925-B) or overdue change intervals dissolve the belt. A case involving £3,500 damage at 70,000 km has been documented.

Symptoms: Brief flickering of the oil pressure warning light, engine noise under load, cracked or missing belt teeth found on inspection — often total failure without prior warning.

The front cover seal on early 1.0 EcoBoost engines (up to approx. February 2015) was not oil-resistant. Oil attacks the seal, causing gradual coolant loss. TSI 15-1070 addresses the problem.

Symptoms: Coolant level drops without visible external leak, temperature warning, whitish steam from engine bay.

Boost control solenoid or turbo wastegate can cause boost pressure issues. Intercooler leaks also occasionally occur, causing intermittent power loss.

Symptoms: Noticeable power drop, code P0299 in fault memory, engine in limp mode.

Gen3 engines also occasionally show early catalytic converter failure. Code P0420 cannot be hidden at an MOT and requires replacement.

Symptoms: Engine warning light P0420, flagged at MOT emissions test.

The wastegate actuator rod on the small turbocharger vibrates due to a leaking vacuum actuator. Leads to power loss and fault code P0299 (underboost).

Symptoms: Rattling noise from turbo area, noticeable power drop, fault code P0299, engine in limp mode.

Brake lines and fuel lines corrode faster than comparable competitors. TÜV inspection failures due to brake line corrosion are common. Leaking lines are a safety-critical issue.

Brake lines corrode faster than on comparable competitors. On older vehicles there is a risk of line fractures, which can cause complete brake failure. Check thoroughly before buying.

Rear springs break through corrosion at the lowest coil, similar to the predecessor. Shock absorbers leak prematurely and ride quality deteriorates.

A defective auxiliary heater relay results in inadequate cabin warming. The heater blows little or no warm air in cold temperatures. Solution: relay replacement per TSI 70/2010.