dtc 038096 renault dci preheating fault

vehicle came in with a eml light on amd th following fault code was a permanent fault DTC038096 which is a preheating fault. First thing to check on and preheating fault is the glow plugs and yes I found that 2 out of 4 had failed. is is possible to just replace the ones that are faulty but as good practice it&always best to replace the 4 as they have all done the same amount of work! I cleared the fault codes using an @AutelTools 908s pro and the car is now running perfectly as it should be with now lights on dashboard. #sendit