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I know auto zone will scan your van and tell you the code and why the service light came on. They don't charge to do it. Mine came on and it was the EGR valve. I went and bought one and changed it and went back to Auto Zone and they cleared the memory. The EGR valve has a little orifice in it and it got pluged. A little pin opened the it now I hav a spare EGR valve..... I wish I took it off first before I went and bought one..... I would think most parts place would ck your computer to tell you whats up. Auto Zone sold me an EGR valve... good luck
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