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A clogged EGR can affect the way the car runs since the engine computer is programmed with certain parameters in mind, causing it to run lean. O2 sensors usually fail showing lean which means the car will run rich. A clogged EGR will allow more fresh air than is designed and therefore letting the car run hotter. If you look up a generic list for reasons for a burnt hole in a piston, clogged EGR comes up as one of them.
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