I'm getting a P1400 code on my 2011 Maxima. The car has 250K miles. The symptoms are intermittent gray exhaust on start-up and occasionally higher than normal idle (2-300 RPMs higher). No oil loss or burning. After the initial start-up, no noticeable exhaust.
When my old Altima had this problem, it was an EGR solenoid.
Any ideas on my Maxima?
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