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Q: It's easy to change the egr valve,how it looks, what tools do I need? Code p0401 on 2005 Ford Freestar

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The comp gave me code p0401, it reads insufficient flow detected can the valve be clean or is better change it ?
(2) Answers
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The code refers to EGR system fault....very unlikely that the EGR valve is at fault. More likely to be DPFE sensor, EGR system module, or restricted EGR ports. Need to do pinpoit testing to determine the cause.
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