If you have oil pressure it is working.
My guess is low or no oil pressure.
Could you tell me how would you replace the oil pump on a Mazda Protege?
No oil pressure
Remove oil pressure sensor and install a manual gauge
No oil pressure - after checking with a manual gauge
Low or no oil pressure.
You didn't say what the problem is. But if you question the sensor, replace it, it probably cost lest than $20.
th purpose of an oil pump is to PUMP...OIL
Its just trust!
hard workng
You can pressure test with a gauge using sensor location
Yes, Change the oil pump... If the oil pump stopped working, severe engine damage is likely. A new/ rebuilt engine may be necessary. The only way to tell for sure is to tear down and inspect the old engine.