I have a 2006 Laguna II DCi GT 175 I have bought from a garage from away, it has developed a fault where it goes into limp mode every few miles after hard acceleration. Its says check injection on dashboard. A friend hooked it up to a snap on tools diagnostic computer which said it was lambda sensor and camshaft sensor faulut. Both have been replaced and it makes no difference?? Any ideas?? As an afterpoint, the headlights are rubbish as in very short range and someone else on forum said there is a sensor for suspension front and rear for auto light adjustm,ent. Is there any way (yes I know far fetched and grasping at straws) the two could be connected?? Fault code is P0544 by the way.