Ok my check engine light went off on sunday and the code was 0135 i havent fixed it yet kuz im waiting for the weekend and now today after i got out the mall i saw that the light disapeared???????????????????????? WTF???? DID IT FIX ITSELF.................NOW what does this mean??? im still gonna change my sensor but wat does this mean?????

 

It's not "0135", but "P0135" ( O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
Is it?

 

it is probably on it's way out... i'm sure it'll come back on and off and on and off... etc. etc.

 

where is this o2 sensor located exactly n e way????

 

Just wait and if it comes back and stays on then replace it. It is located on the y-pipe, you get to it from under the car and it plugs into right in front of the radiator.

 

What are you guys using to check the codes? I would like to get one of these. Is this what they call a scan tool? Which one to get?

 

OBD II scan tool.

or you can go to the nearest AutoZone. they pull up these codes for free.