P0300 means your engine has a random or multiple cylinder misfire. Get AI diagnosis, UK repair costs and fixes for fault code P0300. This guide covers the specific causes, symptoms and fixes for the Ford Fiesta 2008–2018, with UK repair costs.
Ford Fiesta P0300 is very commonly caused by ignition coil failure on the 1.0 EcoBoost engine. The coil pack on this engine is known to fail between 50,000–80,000 miles. Individual coils can be swapped between cylinders to identify the faulty one.
The affected engine variants are: 1.0 EcoBoost, 1.25, 1.4, 1.6 petrol. If your Ford Fiesta is showing fault code P0300, use our AI Diagnostic Report for a full UK-specific analysis including the exact repair costs for your engine and year.
While P0300 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 P0300 fault code page.
Typical UK repair costs for P0300 on the Ford Fiesta range from £80 to £500 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.
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An active P0300 fault code on your Ford Fiesta is likely to cause an MOT failure. Under DVSA testing standards, an illuminated check engine light is an automatic MOT failure regardless of how the vehicle drives. You must resolve this fault before your MOT test. Read our full MOT guide for more information.
Last updated: April 2026. Information specific to Ford Fiesta 2008–2018 UK models. AI-Diagnostics-Pro provides AI-generated information for educational purposes. Always consult a qualified mechanic before carrying out vehicle repairs.