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AAboy, Master Technician
Category: UK Car
Satisfied Customers: 294
Experience:  HND Mechanical Engineering
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Ford fiesta: a yellow warning light has come on the dash board looks

Resolved Question:

i have a ford fiesta and a yellow warning light has come on the dash board looks like a square with a t at the top???
Submitted: 8 years ago.
Category: UK Car
Expert:  AAboy replied 8 years ago.
Hi there

The Engine Management Light / Check engine light will come on if the ECU has detected a fault in the engine management system. The fault could be many things…a faulty sensor or actuator, emissions too low / high, defective wiring, blocked cat etc, to name but a few. A fault code will then be stored in the ECU to assist diagnosis. The code can be read using a suitable scan tool, which most good local garages now have. A typical cost for this would be around £35 - £50. The code description will guide the technician to a specific area of the car for further investigation. Once the fault is rectified, the EML can be reset with the scan tool. Having a scan done is the most cost effective way to solve the problem, as repairing by part substitution can be very expensive guess work.graphic

Hope this helps



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