P0171 System Too Lean - Bank No. 1. ERROR

[DeathWish]

My service Engine Light comes up... Here are the 2 error codes:

P0171 System Too Lean - Bank No. 1.
P0174 System Too Lean - Bank No. 2.

I have a MAC Straight Shot Mass Air Intake,
SLP Xpipe
SLP Catback

Any suggestions? Do I need to program my car?

 

[eleanor'03]

i kno if u take ur cats out and replace it w/ an xpipe ur mil will come on...at this time u have to get mil eliminators from steeda or pony express which is cheaper

 

[DeathWish]

i kno if u take ur cats out and replace it w/ an xpipe ur mil will come on...at this time u have to get mil eliminators from steeda or pony express which is cheaper

Nope... i think it has to do with either the Mass Air Sensor being bad, or needs tuning. I had not programmed my car's computer for my mods.

 

[2Blown98]

did the light come on right after one of the mods you have posted?I ask because you would not get those codes from installing an off road x- pipe. It would be two different codes because 171 & 174 refer to bank 1 sensor 1 and bank 2 sensor 1 respectivly indicating that there is a lean condition. The rear sensors monitor catylist function and they would be the ones effected by installing an x-pipe without converters.you probably just have a vacuum leak

 

[DeathWish]

did the light come on right after one of the mods you have posted?I ask because you would not get those codes from installing an off road x- pipe. It would be two different codes because 171 & 174 refer to bank 1 sensor 1 and bank 2 sensor 1 respectivly indicating that there is a lean condition. The rear sensors monitor catylist function and they would be the ones effected by installing an x-pipe without converters.you probably just have a vacuum leak

I had all my mods installed about 4 months ago. The Service Engine Light has been going off only recently.