hi there i know the R owners can know a lot of things. Well after some racing and high speed driving(160+mph) on monday the check engine "emission system service require" appears when i came to my house. After let the car cool down i erase the codes with my ppc.<p>Next day i saw my tank with less than 1/4 of gass i saw a little lose of power i was thinking about fill the gas and see.<p>After i went to the gas station start to make some test:<br>in 2nd and 3rd gear on the 4000-5500 rpms there is some leak of power is like the engine is trying to pull but nothing happen so weird. <p>When i shift to 4th gear there is some fart and the leak of power feeling is more, the same in 5th gear.<p>Today we check with my friends at the dealer the fuel filter, lines, diverter, coils, sparks and O2 sensors(cat and downpipe).<p>We saw that the cat o2 sensor doenst have any sign and reading, it stay on -0.2V and we checked the sign, working cond, everything and nothing..no reading at all so i think the o2 on the car ot out.<p>My question is, can a o2 sensor can make that weird behavier on my car? on high rpms?