Help please; CEL and a couple other issues =/
 

The CEL just came on after i just bought my rx-8 used off a dealer.
it has 45k miles and i drove about 40-50 today.
2004 model.
any ideas why the CEL would come on?

also when i turn my car off completely i hear a popping/cracking noise coming from the back, i'd say from the exhaust or.... trunk?
1 pop/crack every 30-50 seconds and heard about 5?

does anyone else's shift knob seem to rattle/rumble when in neutral?

i'd really appreciate any knowledge concerning these issues. thanks

2004 is series 1, PM a mod to move it and you probably get more responses

^+1
And get the code pulled so you (and us) know what system is failing.
Autozone will do this for free.

thank you guys.
i went to my dealer and his mechanic.
idk what the code said but the mechanic said it was a gas cap code.