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Okay, i have three sensors, ill post a pic later...

Again i tried to read out fault codes, and now the car report fault 15, bad o2 sensor. So i will bye a new one.

So, have you fixed the problem and has your fuel consumption decresed?

No i stille have the problem, i try change the o2 sensor, but dident change 2 much. But i dont know if there could be a problem with the new o2 sensor? The readings i get when i meassure it seems to be wrong, it says only 0,001 volt and do not change at all....

But i dont get any fault from the ecu anymore.

Have you checked the MAF voltage?

I also have problems with the idle, when it is cold, it run about 2000rpm, when it get hot it fall to 750. But when i drive a little trip, and stop for idle it goes up to 1100 and dont go further down.... If i start and stops the car the idle is perfekt 750... If i rev the engine it falls back to 750. but if i drive again, then it goes up to 1100rpm... If i put it in gear and slip the clutch a little, so then engine falls under 750, and the take the clutch fully agaín, it stabilise to 750rpm again...

Could this problem be related to my high fuel consumption??

mine does that when its really cold out, I have not found a source for it as of yet but if I do I will post it.