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Low oil pressure can be many reasons bad or dirty sensor at right rear of engine or your car can have a sensor in the side of the pan passenger side. a weeping head gasket allowing moisture or a water pocket to build up at the sensor water cant properly pressurize the sensor.....

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Q: What would cause low oil pressure reading on a 91 ford aerostar no engine noises 4L V6 Do you know where you can find oil pressure sensor unit It was normal dropped and then went up again and now low?
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