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I have a 2012 Nissan Quest with p0021. Rough idle. Happens completely randomly (possibly when the engine gets hotter, but not always). I have changed the oil and filter (full synthetic 5W30 as always). And changed one of the cam shaft positions sensors. I can't find a diagram and part number for the Intake Valve Timing Control Solenoid....as this is what the code points to. The issue has happened 1 other time and changing the oil resolved it

Vehicle: 2012 Nissan quest

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The valves are in front of the engine. See attached image.

2012 Nissan Quest Intake valve timing control solenoid valve location

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