All my brake warning lights are on. My oil filter won't come off either.

This is not a DIY issue as a professional scan test is what it is going to take to find out why the lights are on!.. 'NOBODY' can tell what it is without the scan test!!.. Any good independent shop should be able to do this... Not a parts store, they don't have the proper equipment... As for the oil filter cover... It takes a special socket made of steel (not the plastic type) to remove it.. If it's already been messed up by using the wrong tools... No choice but to use a BIG pair of 'quality' slip-joint pliers to remove it then install a *new cover*.. It was over-tightened during the last engine service by someone that had no idea what they were doing!!! Stay away from that person for auto service in the future.. Good luck!