Anyways, I have two problems.
1.The check engine light comes on after 15 mins of driving. I'm planning on changing the o2 sensor but w/e.
and
2.(my major problem) The coolant light/buzzer turns on, and there is oil in the coolant. Is this the coolant seal? do I have to get it rebuilt?

 

The CEL could be the OMP... seems like a lot of those are going recently. There's a writeup on how to check codes in the archive at the top of this page.

 

How do you know it's the O2 sensor?
Why don't you scan the error codes and know EXACTLY what's causing it???


-Tedh