Modern diesel engines are fitted with a component known as an EGR Valve (Exhaust Gas Recirculation).
The valve often either fails electronically with a fault with the EGR position sensors or due to a carbon build up which prevents the valve from opening or closing. If the valve sticks in the open position it can cause both starting and general running issues and more often than not will bring on the engine management warning light and the vehicle will go into limp mode.
















