You’ll need to manually check your Mountaineer’s fuel pressure if the reading seems off. You can also use it to check the fuel pressure reading as you drive. If your Mountaineer’s fuel pressure regulator goes bad, it can restrict the flow of fuel to the point that P0193 can be thrown.Ī good scanner can help you look at the conditions that were present when the code was set. The fuel pressure regulator is responsible for making sure that the amount of fuel pressure that reaches the fuel rail is at a constant level (which will be less than pushed by the fuel pump). Does it look broken or damaged? Is the connection to the sensor solid? If it looks bad, it may need to be replaced. Take a look at the wiring harness around your Mountaineer’s fuel pressure sensor. Wiring issues can cause P0193 to be thrown. If it goes bad (or if the fuel pressure really is out of the normal range) P0193 can and will appear.Ī bad fuel pressure sensor can force the vehicle to overwork the fuel pump, thinking that it’s constantly starving for fuel when it is not. The fuel pressure sensor is responsible for telling your Mountaineer’s ECM/PCM what the actual fuel pressure is. Here are the most common issues that cause P0193 to be thrown in the Mercury Mountaineer: Fuel Pressure Sensor Poor Fuel Mileageįuel mileage can suffer when the air/fuel mixture isn’t correct. This can lead to the engine dying when coming to a stop as well. If the fuel pressure at the injectors is inconsistent, it’ll be really hard for your vehicle to maintain a steady idle speed. P0193 can be caused when the fuel pressure regulator is bad. If it runs too rich, you may get black smoke and P0172. Without a reliable reading from the fuel pressure sensor, your vehicle may end up with the wrong air/fuel mixture. There may also be a noticeable lack of power. With too much fuel getting to your Mountaineer’s fuel injectors or the PCM, the engine may stall out or hesitate in certain situations. With P0193, there will likely be some observable symptoms. The fuel pressure reading is incorrect (bad fuel pressure sensor, or wiring issue).The fuel pressure reading is correct and abnormally high (likely a fuel pressure regulation issue).With P0193 there can only be two things going on with your Mountaineer: While P0193 is a generic code (it has the same meaning for any vehicle made for the 1996 model year and up), it can have different repair steps depending on what type of engine your Mercury has and the model year. It indicates that your Mountaineer’s fuel rail pressure sensor is sending a signal to the PCM that is above its normal operating range (in terms of voltage value). P0193 is a generic OBD-II code that can occur in the Mercury Mountaineer.
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