Nissan Juke 2011

Have the car 5 years no problems with it, can take two turns of key in winter mornings, but always starts. Fitted with Aircon, CD player, electric mirrors, 4 electric windows, Radio - all still functioning 100%. Timing belt done etc. Front tyres good back need replacement. The price offered based on two engine lights that came on recently before due for NCT. My mechanic says it is probably an issue with injectors and could run grand for months or even years but will eventually damage the engine if not sorted. Estimated cost between 800 and 1800€ to sort. It is driving perfectly still. Also two cosmetic scratches plus minor dinting on driver door.