EGR (Exhaust Gas Recirculation) valves recirculate exhaust gas back into the intake to reduce combustion temperature and NOx emissions. They also clog up with soot, fail electrically and cause limp mode — which is why EGR delete is a popular service.
Why EGRs block
Diesel exhaust soot + crankcase oil vapour bake onto the EGR valve and intake manifold. Eventually the valve sticks open or closed, throwing fault codes and putting the car into limp mode.
What an EGR delete does
A proper EGR delete is two parts: 1) a blanking plate or removed valve in the hardware, 2) a remap that tells the ECU to stop expecting EGR feedback. Without the remap, you'll just get a different fault code.
Pros
Cleaner intake long-term, no more EGR-related limp mode, slightly cooler combustion temps under load.
Cons & legal position
EGR removal is an MOT failure on UK road-registered vehicles. We only carry out EGR delete on off-road, export, motorsport or agricultural vehicles.
The alternative — EGR clean
If you want to keep your vehicle road-legal, we offer ultrasonic EGR and intake manifold cleaning that restores most blocked EGRs to working order.