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CEL Code 2-4-1 AGAIN! 700

Hello everyone! I am again having a CEL for 2-4-1, and after I reset the code, by disconnecting the battery cable, it usually lasts around 1000 miles until it agains turns on. 1991 Volvo 740 non-turbo, 181,000 miles and it runs so sweet, many parts have been replaced! This is the only issue I have with this car! Which is the most likely to have worn out first: The EGR Vacuum controller, or the EGR Temp Sensor? If it is the EGR valve itself: I have no darn remedy for that possibility! Thanks so much! Jeff






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