Where is the preheat relay on a citroen c5?

The preheat relay on a Citroën C5 is typically located in the engine compartment fuse box. Depending on the model year, it may be labeled specifically for the glow plugs or preheating system. To locate it precisely, consult the vehicle's owner manual or the fuse box cover for a diagram indicating the relay's position. Always exercise caution when working on electrical components.