Originally Posted by sgsoccerplaya
yeah, one of them is. i ran the codes and it was an oxygen sensor, an oxygen sensor heater, and a fuel supply system. i don't really know why it would be an oxygen sensor since i had that replaced when i bought the car. but what exactly is the oxygen sensor heater and why is there a code coming up for the fuel supply system?
the oxygen sensor does not work until it reaches a certain temp. it would take a long time for it to reach that temp without a heater. its basically emissions related. the faster the o2 sensor heats up the quicker the car can go into closed loop mode and meet emissions regulations. do you know the code numbers? if i get numbers i can look up the code and give you more info. also depending on the year, there may be more than one o2 sensor