Hi i have a daf lf on a 08 plate the ad blue light is constantly on but have had it checked over mechanic reckons sensor issues when driving at low speeds it tends to jerk alot and when start it up engine warning lights up and it goes into limp mode for a few seconds only anyone had similar issues and if so whats best cure thanks in advance.
I guess you mean the MIL light …That does not necessarily mean it has an ad-blue fault …That will come on for any engine issue ,be it an injector fault a sensor faulty ie boost sensor ambient sensor etc ,and also the ad-blue issue …So basically you need to get the fault code read ,as there are so many fault that can bring the light on ,there is no way to pin the fault down with out the use of DAVIE