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?
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.
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 http://www.seat.co.uk/owners/diesel-engines/vin-number.html
Dave Pollard has written several Haynes manuals and has tested just about every car-related accessory — read more from Dave here.
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