On Board Diagnostics

I have a 1999 Pontiac Grand Prix and the engine light is on. Although it appears not to hamper performance, I went and bought a OBD II Tester.
I now have the codes in question, were can I go to find out what is causing these problems.
Also since this is a used car, I thought of clearing the codes and starting new, is this possible.
Any info on this matter will be appreciated.
Thanks.
Jeff
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There are numerous places to look up the codes. Do a google search. WWW.autotap.com has some explanation. One way of getting help would be to post the codes in your message. There is plenty of expertise here. Get an explanation of what codes there are before you clear them. If the problem persists the light will come back on although it may take days or weeks. Also if you are due an inspection within a month don't reset them as some of the non-continuous monitors could take several drive cycles to complete.
<DIV><FONT face=Arial size=2>I have a 1999 Pontiac Grand Prix and the engine light is on. Although it appears not to hamper performance, I went and bought a OBD II Tester.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV> <DIV><FONT face=Arial size=2>I now have the codes in question, were can I go to find out what is causing these problems.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV> <DIV><FONT face=Arial size=2>Also since this is a used car, I thought of clearing the codes and starting new, is this possible.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV> <DIV><FONT face=Arial size=2>Any info on this matter will be appreciated.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV> <DIV><FONT face=Arial size=2>Thanks.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV> <DIV><FONT face=Arial size=2>Jeff</FONT></DIV></BLOCKQUOTE></BODY></HTML>
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Thanks Woody for your help. I now have a new problem, but I will post a new message for assistance.
Jeff
<DIV><FONT face=Arial size=2>I have a 1999 Pontiac Grand Prix and the engine light is on. Although it appears not to hamper performance, I went and bought a OBD II Tester.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV> <DIV><FONT face=Arial size=2>I now have the codes in question, were can I go to find out what is causing these problems.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV> <DIV><FONT face=Arial size=2>Also since this is a used car, I thought of clearing the codes and starting new, is this possible.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV> <DIV><FONT face=Arial size=2>Any info on this matter will be appreciated.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV> <DIV><FONT face=Arial size=2>Thanks.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV> <DIV><FONT face=Arial size=2>Jeff</FONT></DIV></BLOCKQUOTE></BODY></HTML>
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