Hi I have an Audi A6 2.0 tdi 2006, just recently it has developed a misfire. I took it to a diesel specialist who said i had fault codes on the injector loom, which is located under the rocker cover. I changed the loom took it back and he cleared the codes, but misfire was still present with no codes showing. The misfire is getting steadily worse it seems to be on tick over ,up to 1600rpm it seems to disappear, when holding at 1600rpm it is always misfiring but as you increase rpm 1800+ it disappears and comes back around 3200rpm I have done all the basics eg. fuel filter / air filter but no difference and like i said no codes showing up. When i had the codes read he used a snap on solas machine which also read the injectors pressure, he pointed out that three injectors were minus and one was reading +128 this was number 2 injector, he said that the nearer to zero the injector reads the better it is , so in his opinion i need to change number 2 injector. I didnt get a feeling of confidence from him which worried me slightly first the loom then an injector, what next ? Can anyone help?