my engine light came on, this isn't the first time. the first time was a couple weeks after i bought my integra, and the scanner said it was the o2 sensor. i bought a universal NGK o2 sensor and it fixed it for awhile, but then the light just came on again, and the scanner said it was the o2 sensor again.

i noticed that i lose a lot of gas, very quickly. i put in 20 dollars worth of gas and its gone at the end of the day... i get something like 70-80 miles. someone said it's not the o2 sensor, but i need help before i waste money on buying something i don't need.

thanks

 

Are you sure you replaced the right O2 sensor, since is obd2 there is 2 O2 in the system.
If you can, borrow a scanner and check the data to see what are the O2 sensors reading, is there any other problems with the car?