Lisa you should have the oil pressure check for good oil pressure if your pressure is good then have the oil pressure gauge sending unit changed. The ECM reads low oil pressure that is why your check engine light is coming on. If you do your work your self great if not make sure that you have a TRUSTED preson look at it. I have heard horror stories about untrustworthy people how call themselves mechanics. If you had no oil pressure or low oil pressure the engine would not be running for very long. Good luck