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P0403, P0401

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Hi, I have a 2001 dodge grand caravan sport. 340105km on it. I have the codes on the title. I changed the EGR valve on it, but the codes aren't going anywhere. What should be my next step?

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follow the troubleshooting here:

 

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Did you use the OEM part?  Check all electrical and vacuum line connections for cleanliness and tightness.  Clear the codes.

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