How do you change glow plugs on a t4?

To change the glow plugs on a VW T4, first disconnect the battery to ensure safety. Remove the engine cover if applicable, then locate the glow plugs, which are typically found near the cylinder head. Carefully unplug the electrical connectors and use a suitable socket to unscrew the old glow plugs. Install the new glow plugs, ensuring they are torqued to the manufacturer's specifications, reconnect the electrical connectors, and reassemble any removed components before reconnecting the battery.