well, this is my first versa, and my parents second. They have had the light come on plenty of times in both versas. ( an 07 & 09) The 09 light came on just under 7000 miles, and 10,000 miles. They said the oxygen sensor was bad both times, and they replaced it. Now it came on again about a week after the 10,000 miles, and we never botherd to take it in. My mom said it was raining one day, and she hit a really bad pot hole on the hwy, and the light turned off and has never turned back on since, lol. Now they get oil changes anywhere, and use 87 gas. I go to the dealer and get synthectic blend oil change, and I use mid grade gas. I have never had a problem with my versa, with the light coming on. But its almost a yr now, and I only have 5500 miles on it, so we will see. They have about 17,000 miles on theres and its almost a yr old too.