Hey guys, tonight my service engine soon light came on, I was wondering what do I have to do to take it off? like what do I have to fix or w.e?

you need to have it scanned to see what the problem is.

1. Autozone/Advance/Any auto parts store should be able to do it for you.
2. Get an Aeroforce Scan gauge or any other scantool to read the codes yourself.

Check your gas cap, make sure it;* on tight. Then go ahead and drive on it for a few hours, it should turn off if thats the issue. Another option is to activate your Onstar and have them do a diagnostic check for you. I have had the same problem as you twice, and it was that pesky cap both times. Cross your fingers, this could be a cheep and easy fix for ya. Good luck!

had the same problem and bought the cap and it hasn't gone off. going out on a trip tomorrow and starting to worry. any way to reset the code . I tried the disconnect the battery for 30 seconds didn't know if that was long enough. killed the radio though

p13088 was the code or something like that.

after some digging
http://www-odi.nhtsa.dot.gov/

Office of Defects Investigation (ODI)

Service Bulletins - Search Results
2 Records Displayed.


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Report Date : November 20, 2007 at 12:07 AM
SEARCH TYPE : VEHICLE
YEAR : 2004
Make : PONTIAC
Model : BONNEVILLE


Make : PONTIAC Model : BONNEVILLE Year : 2004
Manufacturer : GENERAL MOTORS CORP.
Service Bulletin Num : 01505 Date of Bulletin: JAN 01, 2004
NHTSA Item Number: 10005487
Component: FUEL SYSTEM, OTHER
Summary:
LOOSE FUEL CAP MESSAGE AND DIAGNOSTIC TROUBLE CODE (DTC) P0440, P0455. *TT *MJ

Make : PONTIAC Model : BONNEVILLE Year : 2004
Manufacturer : GENERAL MOTORS CORP.
Service Bulletin Num : 11052003 Date of Bulletin: NOV 05, 2003
NHTSA Item Number: 10013138
Component: FUEL SYSTEM, OTHER
Summary:
DIAGNOSTIC TROUBLE CODES P0440 AND P0455, ALONG WITH A LOOSE FUEL CAP MESSAGE DISPLAYED ON THE DIC ON VEHICLES WITH 3800 ENGINE APPLICATIONS. *TT

wee

Did you get the code scanned?

Yes, let'* get a scan. It may be something a bit more serious.

I got it scanned and they said it was the rear 02 sensor, so I bought it put it in...still light on so now I think its the CAT

Well I'm a idiot and forgot to disconnect the battery after puttting in the sensor so I'm doing that today since I just got my car back, if its still on I'm going to get it scanned again then tell you guys the code.

I got the code since it came back on today, and its the same code from last time, the guy from autozone was like its the sensor again but it can't be so heres the code if someone could tell me what it is, most likely the cat.

Code: P0420