Suleman

Hi All, I own a 2016 Insigian 1.6 diesel 134BHP & have been experienceing an issue of unbalanced injectors. The first time I had the code read it said injecror 1, the mechainc cleared the code & about a week later it came back again but this time it read injector 3. I was able to get 4 replacement injectors & had them all changed out but still the issue continues. Can any one please help?