I too had the 02 sensors codes and my mechanic said to replace both sensors, he said it would help my gas millige and it did. I was getting 15.4 miles per gallon and now i am getting 16.2 per gallon. If you do some research on the 02 sensors they should be replaced every 70,000 miles .

Hope this helps

My "Service Engine Soon" light came on after I put on and took that cheap intake I had on- off. Bad decision, my mechanic couldn't find any codes either- so maybe it is an o2 sensor? Perhaps...wires & plugs?

i have the same problem occur with the ses light. it actually went off yesterday..any ideas on that?