I'm getting 0171, 0173, and 0174 codes. I've checked EVERYTHING replaced MAF. Check all gaskets and hoses for leaks etc. performed injector cleaner. Car runs great! 14.5 mpg average. Just noticed past few days hard to start since it cooled down a bit in the morning. Def not right, stumbles a lot also upon start up then smooths out. Only first start up in morning though. All other start ups through day are normal. Fuel pressure was good.

Here are 3 graphs of my fuel trims. All for 1 minute time frame.
1 is at idle with high deviation in long term trims both banks. Weird.
The other is at 1500 rpm constant. Long term comes back In good range.
The last one is letting off throttle from constant 1500 rpm and you can see the long term swing back.

 

Hmmm no one can help me

 

Well, I like to think that some problems like this are caused by faulty sensors, so I'd suspect a look at this site might help ( ) get you on track. Unfortunately, your graphs showed variances on both banks at the same time so I'd suggest that there is something common like fuel pressure (? good for you?) or perhaps an air intake problem? I am no expert but it seems odd that both banks react similarly at the same time, and that the problem goes away after warm-up...