Ain't gotta clue....

[1point8teeNW]

Ok, so I've been having this issue with the ol' girl for about the last 10k miles. I'm currently at 107k.

When I floor it and the boost peaks the car feels like it's misfiring or for some reason hesitating. It ONLY HAPPENS at peak boost WOT runs. My gas mileage sucks dick. 250 Miles to a tank MAX driving like a grandma (i.e. staying completely out of boost 85% of the time). I've had a few codes come up in the past but once I cleared them, they've not come back.

One was P0171 and I don't remember the other one.

I pretty sure my primary O2 is shot, but only thing else I can think of is MAF.

Any input? Ask some questions that maybe I can give information for as to get me closer to my problem.

EDIT: The car also goes through times when I seems like I HAVE to stay in boost (1-2 PSI) just to maintain a constant speed (flat road, 0 MPH stationary wind speeds). It's pretty gay considering Indiana is nearly the highest gas in the country (4.15 right now) and I'm only getting 250miles to a 60-65 dollar tank.


Thanks guys.

[AudiA4_20T]

your primary 02 is probably killing your gas milage

[AudiA4Turbo22]

Ur 02 is shot exactly what problem i'm having and my gas mileage is like sucking coolo!

[HeHateMe]

Ur 02 is shot exactly what problem i'm having and my gas mileage is like sucking coolo!

was this a recall? I thought I remember seeing something about that. Could be wrong though.

[AudiA4Turbo22]

^^don't think so, but i also had my MAF changed and didn't fix my prob and the dealer tech told me it's my 02 as well!

[1point8teeNW]

Ok, New O2 sensor it is.

I was hoping I wouldn't get a bunch of "coilpack" replies cause those are all new.

[diztek]

if o2 is bad, wouldnt a CEL come on?

[1point8teeNW]

A long ass time ago I got a code for the 02, but it hasn't been back for over 20k miles.