I can help you out. My diesel Aygo had an injector leaking fuel at nearly 45,000 miles and 1 week before the warranty ran out. I decided to take out the extended 2yr warranty. Since then, I'm on 60,000 and an injector seal failed, which was fixed under warranty. If you're out of warranty I strongly recommend you take your car to a peugeot or citroen (PSA) garage to get it fixed. The engine is a 1.4hdi and is used in many peugeot & citroen models. You'll get a cheaper quote to fix it. £1,300 is ridiculous Diesel version was £1000 more when new and a careful petrol owner could get mpg close to a careless diesel driver. They are also in the same tax band, so the diesel didn't sell well. Best mpg I've ever got from the diesel is a tiny bit over 90mpg, but it was boring doing it.