my car wont start it says oil presure sensor on dash on 1990 BMW 535i

i pulled up at gas station turned car off now it wont start and says oil presure sensor it turns over but wont fire up

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1 answer
There is a oil pressure sensor under the right side where you put the water in car its cheap easy to replace.also there is a good chance it could be your fuel pump relay switch or fuel filter or fuel pump but its best to start with the relay switch or filter