IVE BEEN TRYING TO READ WHY MY CHECK ENGINE LIGHT IS ON FOR 2 weeks now.. at first i thought it was the battery in the ob2 reader so i changed it out but its still not reading... this all happened when i popped a fuze replacing my map light took it to a shop and they fixed the fuze issue but now my ob2 **** dont work.i checked all the fuzes and they all seem to be good.... i went to the nissan dealership to see if they could figure out was wrong and the dood told me the o2 sensor is done completely thats y my scanner is not picking up anything.... but im like that dont make too much sence cause i ve had bad o2 sensors for 3 years..smh (i know).. any info would help so i can get this problem resolve thanks....

 

Have you tried a different OBDII scanner (like I know you can often have autozone scan the car, or even borrow a reader from O'Reilly's). I don't like going to the dealer because the last time I had the one near my check out my idle problem and adjust my timing. Turned out they couldn't figure out the idle and wanted time with the car (which means they wanted to replace everything), and said they did the timing. They charged me $140 for that, and I found out later they never did the timing advance.

S

 

i tried mine and auto zones.... same result....

 

I know this might sound stupid, but it happened to me on the weekend when helping out a fellow maxima owner. Make sure the car end of the OBD2 is actually secured to the dashboard. I tried reading a Maxima this weekend and it kept saying there was no connection. The scanner plug was nice and tight and felt like it was connected. But when I looked under the dash, the port was not in place. It had popped out. So basically I was plugged into air.

 

This happened to me, dealership could not read the codes so I had the LED for the CEL light replaced.