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EGR


EGR, or Exhaust Gas Recirculation, reduces NOx of the exhaust emission by recirculating some of the engine's exhaust back into the intake manifold. Its purpose is to lower combustion temperature and reduce the emission. Usually, this is done at lower rpm example is cruising or in a traffic jam. It was reported that it leads to carbon build-up inside the engine if a particular operation temperature isn't reached. Talk to your local mechanic on how to prevent any build-up.