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P0401 Isuzu -

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I replace the`egr valve,sensor and I still showing checks engine on any other sujestion

Vehicle: 2009 isuzu npr hd 5.2 diesel

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P0410 EGR flow insufficient flow detected

Check the condition of the EGR solenoid, or what is known as Exhaust differential pressure sensor.this is what control the EGR for opening and closing

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