any idear how to solve?

car started make noise like egsaust had gone , loud banging under bonnet,warning depollution ,green flag showed code poo14 camshaft13-bank. took to garage was told needed 2 sensors for cam cost of 200pounds . phone call to say run smooth then back to same fault . car still only 36,ooo miles on 07. bought car when 3 years old now cost 2,000 in repairs plus this bill .never buy another pegeout now owe for car and repairs ! dont know were to turn . help , any ideas feel so sick truly ill though this car.