as it says, ive had the SES light on in my 01 i30 for over a year for a bad 02 sensor, it just randomly disappeared today though, any ideas?

 

Does the ses light still turn on for a second when you start? If yes, light will be back soon. You disconnect battery recently?

 

no, no disconnect, and im not sure if itll do that or not..i couldve sworn it was on earlier today, came out of work, boom gone.

 

lol the bulb went out

 

Sensor or for heater circuit? If it is not working properly, but still relaying information, there has likely been a circumstance where the ecu determined the signal was consistent with proper functioning. I suspect the light will be back within 60 miles.

I have my secondaries laying on top my engine. My SES light comes and goes....even with sensors not reading exhaust.

 

if it doesnt come back within 60 miles, ill plug a scanner and check to see if the code is still being sent, if it is then guess ill go from there.