so engine service came up in the text window and i checked the codes and it says O2 sensor heater circuit malfunction. what in the hell is that. anyhelp that would be great. also is this something that needs to be fixed immediatly?

 

o2 is bad, if you want better mileage then replace it, car will be running a little rich or lean, computer will be heavily compensating while wasting a little gas

 

i knew my mileage wasnt the same. where is the best place to get a new sensor for a decent price. and are they all the same or different like more expensive before the cat versus after or what and how to i figure out which one it is exactly that is bad.

 

these cars are sensitive to oxygen sensor types, i would only suggest bosch, buy online to save money