2.5 four cyl. dodge running lean

2.5 four cyl. dodge running lean. failing emissions for NO; coolant not overheating but running hotter than normal. plugs i pulled had white powder
look to them. i was told it's running lean by a guy at the parts store by the look of the plugs. I guess a lean mixture would make it run a bit hotter too. Should i suspect the O2 sensor at this point? email snipped-for-privacy@hotmail.com and thanks
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and thanks

google.com to find out how to check for codes on this vehicle
Glenn Beasley Chrysler Tech
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