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Why is my 2014 Seat diesel's engine warning light illuminated?

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Why is my 2014 Seat diesel's engine warning light illuminated?

Q. The engine management warning light is illuminated on my 2014 Seat diesel and the stop/start system isn’t working. Could it be diesel particulate filter (DPF) trouble or a VW emissions-fixing issue?
TG, Derby


A. The DPF has its own warning light, so it’s not that, plus you’d have seen a drop in performance. Your description points to a fault with the temperature sensor in the exhaust that tells the engine management system whether the engine is hot or cold.

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The stop/start system will work only with a hot engine and, as the sensor has failed, it has defaulted to the “cold” setting. You can check if your car has been affected by the VW scandal at


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