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Possible Causes

Possible Causes
CARBON DEPOSITS IN EGR VALVE
EGR VALVE ASSEMBLY STICKING/DRAGGING
HIGH RESISTANCE IN THE EGR VALVE POSITION SIGNAL CIRCUIT
HIGH RESISTANCE IN THE SENSOR GROUND CIRCUIT
EGR VALVE ASSEMBLY

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to:  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  . 

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