in the past i have gotten a CEL regarding my o2 sensors....at the time i never got them fixed cuz i dint have any $ at the time....after Nissan reseted the codes out from the computer...my CEL has not been on since (1 yr)....does this mean my o2 sensors are ok??? i am gettin between 17-21 MPG (city and hwy driving) i have 97000 miles on my max....is it time to replace the o2's?

 

I'd replace them if your highway mileage is less than 26mpg and if your city mileage is less than 18mpg. Then again, when was the last time you changed your fuel filter?

~THT

 

when i bought my car at 75000 a major tune up was done...(oilchange....air filter...fuel filters...spark plugs)....now im almost at 100000 and i drive City/Hwy bout the same and i get about 18 mpg

 

A lot of people think the useful life of an O2 sensor is about 100k... my CEL came on for one of the front sensors at about 95k... I decided at that time to just replace both - you can get each sensor for about 80 bucks - and if you do it yourself, labor is free.

Others members of the org have achieved better gas mileage with new O2 sensors...

See this thread: http://forums.maxima.org/showthread.php?t=310584