If its a diesel and it was registered after 09 2010 and its flashing it indicates that the DPF needs a regen and you should drive on a suitable road at about 60 mph for about 30 minutes. If that does not clear it a visit to the dealer and a forced regen is required. If you ignored the flashing light (the dealer will be able to tell from the ecu log) and it stays on permanantly and the DPF is blocked it will not be covered by the 7 year warranty since you have failed to abserve warnings in the handbook and on a sticker on the drivers door.
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