error code

So my check engine light came out. Hooked up the scanner and got the P0430 Bank 2 code. Is replacing the O2 sensor first step? Should I do both? Best replacement one to use? Glad it came on because I was down 2 quarts of oil. Just changed it three weeks ago and all this happened while my...

I have a 2007 Jeep Compass with 4 wheel drive. It has an automatic transmission. While driving, my car did not shift out of first gear. I had to drive it home in first gear, the tectonic shifting did not work either. Engine light came on, read error code P0700, which reads "transaxle control...