Causes of Lean AFR???

[Sentientbydesign]

My wife's CEL just came on and the code she pulled says the car is running lean.

I know, I know, it's not an Infiniti, but this is where I share my knowledge and also look for information. Hopefully somebody can shed some light on this for me.

Grassy-azz

[Beancooker]

o2 sensor can be the cause, but usually it has it's own code.

Don't know about a Toyota, but the IACV or EGR, those could both be a cause.

[rn79870]

Could also be a vacuum leak related to the intake manifold. Too much air, too little fuel.

[RED_DET]

+1

[Sentientbydesign]

Ok. Thanks for the input. I'll have to go check it out. I was thinking o2 sensors, but like Noah pointed out, they usually have their own code. Could also be the fuel pump or injectors, though I kind of doubt it.

I'll go mess around with her intake system and see if anything is out of whack.