P0128 means engine coolant is not reaching operating temperature. UK repair costs, causes and fixes for OBD2 fault code P0128. This guide covers the specific causes, symptoms and fixes for the Ford Fiesta 2008–2019, with UK repair costs.
Ford Fiesta P0128 thermostat fault is common on the 1.25 and 1.4 petrol engines. The thermostat is an inexpensive part and the job is suitable for a competent DIYer.
The affected engine variants are: 1.0 EcoBoost, 1.25, 1.4, 1.6 petrol. If your Ford Fiesta is showing fault code P0128, use our AI Diagnostic Report for a full UK-specific analysis including the exact repair costs for your engine and year.
While P0128 can have several root causes, the most common reasons this code appears on the Ford Fiesta in UK conditions are related to the specific engine management and emissions systems fitted to this vehicle. Always scan for related fault codes before replacing any parts — a secondary code can point directly to the root cause and save hundreds of pounds.
For the complete diagnosis guide including step-by-step testing procedures, see our main P0128 fault code page.
Typical UK repair costs for P0128 on the Ford Fiesta range from £20 to £150 depending on the exact cause, your engine variant and whether you use an independent garage or a main dealer. Independent garages are typically 30–50% cheaper than franchised dealers for this type of repair.
Always get at least two quotes. Use our AI Diagnostic Report to understand the most likely cause for your specific Ford Fiesta before spending anything at a garage.
Specific to your Ford Fiesta — year, engine and exact fault.
UK repair costs, MOT advice and step-by-step fix guide. Just £1.59.
While P0128 on your Ford Fiesta does not directly cause an automatic MOT failure, an illuminated check engine light is an automatic fail under DVSA rules. Get this fault diagnosed and cleared before your MOT appointment.
Last updated: April 2026. Information specific to Ford Fiesta 2008–2019 UK models. AI-Diagnostics-Pro provides AI-generated information for educational purposes. Always consult a qualified mechanic before carrying out vehicle repairs.