The oil pressure sending unit controls the oil pressure light or gauge depending on which you car is equipped with. Basically, the oil pressure sending unit is what sends the oil pressure information to the car’s computer, which then controls the related lights and gauges.Click to see full answer. Beside this, what are the symptoms of a bad oil sending unit? Symptoms of a bad or failing oil pressure sensor The Oil Pressure Light is on. The oil pressure gauge inside your car will give you a good indication as to the condition of the engine’s oil levels. The Oil Pressure Light blinks constantly. In some instances, the Low Oil Light will blink on and off when the oil pressure sensor is going out. Oil pressure gauge is at zero. Likewise, how do you test an oil pressure sending unit? To test the oil pressure gauge sending unit, disconnect the wiring to the sending unit. Measure the resistance between the sending unit terminal and the metal housing. The ohmmeter should read an open circuit (infinite resistance). is it OK to drive with a bad oil sending unit? You could have a bad oil pump. On the other hand, if the level is between “add” and “full,” and then engine was running quietly, you could have a bad oil pressure sending unit, light switch, or oil pressure gauge. You will need to top up your oil, and again, you can safely drive home.How much does it cost to replace an oil sending unit? Know what price you should pay to get your vehicle fixed. The average cost for an oil pressure sensor replacement is between $121 and $160. Labor costs are estimated between $73 and $93 while parts are priced between $48 and $67. Estimate does not include taxes and fees.