CEL for EGR Valve
#4
I had this issue when I first got my NB, I tried cleaning the manifold/EGR stuff out but that didn't help. Rerouting the vacuum line like this thread finally took care of it.
https://forum.miata.net/vb/showthread.php?t=300174
https://forum.miata.net/vb/showthread.php?t=300174
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