got a check engine light on my 07 ls.
running rich bank 1.
changed the o2 sensor and cleared it for maybe a month but its back,
any suggestions?

thanks

 

What kind of sensor did you use?

 

It's been found not all O2 sensors are created equal. Chibi and I have done some research on the topic. From my reading Delphi and AC Delco are the best ones (AC Delco would be just what the factory put on your car, so it's sure to work right).

Not saying other brands WON'T work, I'm sure people have had great luck with all of them, but the odds of people with problems are greater with other brands then the ones I just mentioned.