2015 ford transit 2.2 rwd only passed cvrt

engine has slight knocking sound only passed cvrt before Xmas then on the way home from the test centre engine started to knock it sounds like injector knock but I’m not to sure starts and drives but down on power so probably best to tow it away mileage is 360.000km for sale for parts or repairs price is €2300 or nearest offer sold as seen Body work in in great condition for its year bare the bit of rust above the Winscreen there’s no dents it Got a good bit of work done to pass cvrt New copper brake lines front and rear 2 new rear shocks 1 rear leaf spring 2 rear bumpstops 4 good tyres Rear pads and disks & 1 new brake calliper 4 good tyres 2 front track rod ends & tracking was done