Car 2002 a4 quattro 1.8t

I recently fixed a vacuum leak and was hoping that would fix all my problems before I go to get my MA state inspections. I cleared the CEL and it hassn't come back on yet, but my concern is as follows.

When I cleared the code the engine started to idle really poorly, 30-60 seconds latter it get things worked out. But when I look at all the readings I see that I have a Short Term Fuel Trim of +25% and a o2 voltage of .65+ volt. The CEL isn't back yet but I am worried I won't pass inspection with that.

The thing is I don't understand how that could happen, because a high o2 voltage should drive the STFT negative(or atleast down) right?

I have checked for a Vac leak 2 ways, 1.) Spraying all the leak locations with starter fluid, and 2.) watching the STFT when I bring the engine up to 2500 rpm. Method 2 clearly shows no leaks, but method 1 is inconclusive as sometimes I will get a change in the idle but it is not repeatable.

Could the o2 sensors be going bad? I have noticed that its reading can be erratic some time, once and a while even reading .05v .

Does any one have any ideas?

p.s. The code that the car was throwing before I fixed the vac leak was p0161, but I haven't gotten a new code since I fixed that.

 

after you clear a code you must drive the car around for some time before the readiness modules adapt. only after that will you get a code or an accurate reading on the fuel trims. if there was a problem with an O2 sensor, the code would come right back even after clearing the code.

do you have vag com or are you using another program?

if your using vag com, open the readiness module and drive around until all say passed or failed.(some may say failed or incomplete or unsupported)

if you're using scantool or similar open the emissions tab and click read until they say supported/passed. same applies for the above.