well i hooked up a diagnostic machine to my truck and said it was running to lean.it could be my fuel injectors ,mass air flow sensor or a 02 sensor.how would I know which is the problem?the o2 seems more common then anything
I might just replace it all since it was someone elsew truck and don't know what they changed and didnt.your take?

 

It's usually a vacuum leak when you get those codes.

Rich

 

I just changed my o2 sensors, it was a major PITA. It took ALL DAY and of course nothing went easy. Believe me, you're better off investigating other reasons FIRST (like a vacuum leak) before replacing those sensors.

 

what air/fuel do you consider "too" lean and from where did you take your readings?