Friends Heraldo and Marvarg, thanks for your prompt response and support. Indeed, perform a scanner and the sensor 1 of Bank #1 was giving value of 0.16mv and sensor #2 was giving 0.6mv, that same day we erased the codes but I already locked me again the light of Check Engineer on the board. I will make the scanner again to see what codes he gives me. I also plan to check the spark plugs because the cables are completely new and the mechanic does not check the spark plugs when it made the change. As for the empty hose, which could the problem be caused? From the oxygen sensor with the bad heater, the sensor should be changed or only the heater is changed?