CEL 171/174

Ok throwing p171 and p174 bank 1 and bank2 too lean. I have a 2007 4.0 4x4. I installed a K&N CAI about a month ago and it just now threw the CEL.

My question is, if I replace the sensors will the CEL clear out and run ok?

If I return the intake back to stock will it fix the CEL ...or are the sensors shot?

Would it be worth it to get a tune?

I had a feeling that it wasn't running right when I installed te intake. It was sluggish and I feel like I lost power and MPG. Any advice and help would be great.

I don't want to go back to stock because I love the intake sound

 

I would go back to stock and clear the codes ( disconnect the neg battery terminal). Then see if it comes back. It is probably an issue with the intake.

 

I'd check to be sure you don't have a vacuum first. all the vacuum lines are plugged properly etc.

 

Maybe check and clean your MAF sensor, could be covered with K&N oil.

 

MAF looks good. Vacuums are all good.

Thanks for the help fellas!

 

if there is no vacuum leak and your maf seems to be ok, I suggest putting it back to stock and seeing how it runs then