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I have changed the egr valve and the catalytic converter, I am still getting the p0404 code. What else could be wrong
Vehicle: 2001 gmc jimmy

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P0404 Exhaust gas recirculation circuit range / performance

No EGR flow best describe P0404, plugged either at its intake area or the EGR tube.

 The Jimmy should have a exhaust tube, that area you can check to see if its plugged,

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