my check engine comes on whenever i get on the highway and its not warmed up completly. and it stays on until i turn off the car. then i immediatly turn it back on and its fine. i checked my ecu and its flashing once, and from what i understand this has something to do with my o2 sensor. how can i fix this.

 

your O2 is lazy just replace it and y should be fine

 

how often should i replace an o2 sensor? thanks

 

yeah my engine light does this sometimes when i hold it at a steady 2-3k RPMs for a while. but it throws a code 3 for my map sensor...