Are you sure its the immobiliser thats causing the problem ? Seems strange that it starts with a tow but not on the key. These cars seem to suffer from starting problems when using the key. Does the Immob light go out or is it on all the time or flashing ?. People have had problems where they have had to use the hand prime bulb by the filter to prime the system before it will start on the key. How many miles has it done? Service history etc.joesmith said:help,sedona 2.9 crd 2003,car will not start but if towed will start! immobilser seems to be stopping diesel getting to fuel pump thus not starting with key but with a tow. has anyone any answers?