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VW polo has an engine BKY with an Exhaust Gas Re-circulation (EGR) and the other has no Exhaust Gas Re-circulation (EGR). Are the two engines interchangeable without any problems, or there is need for re-coding of the ECM to match the change or new matching ECM is required.

hie I do have VW polo 9N3 of 2005 with 1.4L BKY belt driven engine with a 4 speed 001 automatic gearbox with identification code GJG. I did a rebuild on the engine after the timing belt snapped about a year ago and the engine operated well after the rebuild but now the engine is smoking and i...