What the EGR system does
Exhaust gas recirculation (EGR) feeds a measured amount of exhaust gas back into the engine to reduce nitrogen oxide emissions. Over time carbon builds up in the valve and pipework, and the valve can stick open or shut.
Signs of an EGR problem
Common symptoms include hesitation or flat spots, rough idle, black smoke, an engine management light and the vehicle dropping into limp mode. Because the same symptoms can have other causes, the system is tested with diagnostic equipment before anything is replaced.
How we approach it
Fault codes and live data show whether the valve is responding as it should. Depending on the result, the answer may be resetting adaptations, cleaning, or replacing a faulty valve or sensor. If the work needs a workshop, you’ll be told. EGR systems are left in place and working: disabling them on a road vehicle isn’t something we do.
Questions about EGR solutions
Can an EGR valve be cleaned rather than replaced?
Sometimes. It depends on how badly it's carboned up and whether the valve's motor or sensor has failed. Diagnosis shows which.
Will you blank or delete my EGR?
No. Disabling emissions equipment on a road vehicle isn't legal, so the aim is always a working EGR system.
