Q: What causes engine bogging and loss of power in '04 Nissan Quest w/no warning? on 2004 Nissan Quest

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Cannot get RPM's over 1500 after car warms up. No warning lights on, engine gets louder and sounds like low growling.
(2) Answers
It is not ease to diagnos a "modern"vehicle if there is no Check engine light on and that full of all kind of sensors.
But by the symptoms i would think a clogging catalytic converter that blowing back fumes to engine.
But i am just guessing. That would be best to take it to a professionl shop.