p0171 system lean on tsi egnine

[MarkR]

well my check engine light came on yesterday and scanned it. p0171 system lean bank 1 was stored,. i didnt clear it but the check engine light turned off today. this was the second time this has happened. the car is not not running rough or anything and theres no hesitation under load. the car is at 40,xxx miles. im 100% stock also. has anyone ever had this issue? im thinking i might have a small vaccum leak somewhere. also what is a boost leak? perhaps this is causing the issue?

 

[vagike]

you didn't get it scanned with a vag-com.
Further details from vag-com freeze frame will help to diagnose.

 

[obdboost]

you check your intake manifold where the rod is? there know to pop out and make the car run lean

 

[steelcurtain]

bad o2 sensor closest to the turbo (bank 1)

 

[MarkR]

i dont want to rule that out. is there any test i can do? i dont have a vag-com. im sure these cars have an a/f sensor so im assuming the 02 sensor before the cat.