![]() A bad O2 sensor will show a lean mixture more often, though. The computer will still adjust the air/fuel mixture to compensate. Oxygen Sensor– The P0172 code is thrown when the B1S1 O2 sensor does not register the right amount of oxygen in the exhaust.Here’s a great YouTube video on how to find a vacuum leak. Take a look around and see if you can find a vacuum leak. Vacuum Leaks– With the Ford Taurus, a vacuum leak is one of the most common causes of the P0172 code.Here are the most common causes of P0172 in the Ford Taurus: If your Taurus has only one cylinder head (inline four or six), bank one will be the only bank, and you don’t need to concern yourself with which side of the engine is which. The side of the engine with the first cylinder is bank one. If your Taurus’s PCM detected a lean condition, it would store P0171. When the bank one O2 sensor detects that the mixture is richer than the engine control module is calling for, it’ll throw P0172. Your Taurus will want a rich mixture at certain times (such as when your car is warming up). With that in mind, either too much fuel or not enough air can cause a vehicle to run rich. The A/F ratio for ideal combustion is 14.7 parts air to 1 part fuel (14.7:1). A rich fuel mixture contains too much fuel in relation to air. P0172 is thrown when the oxygen sensors detect that the air-fuel mixture is too rich. Taurus P0172 Code Meaning Fuel System Too Rich Leaking Fuel Injector, Too Much Fuel Pressure at the Fuel Rail, Bad Air Filter (full list below) It’s not the most complicated OBDII trouble code to diagnose. This code number references a number given to you when you plug your car into an OBDII scanner. Ford evidently is aware of this problem, or they would not have revised the wiring harness and given special installation instructions to their technicians.A common trouble code with the Ford Taurus is P0172. We are convinced that this is a manufacturing defect and that the possibility of more related accidents increases as current vehicles age. This wiring problem should be investigated as a possible cause for any Ford Taurus fires, or accidents involving loss of power. I am concerned that this problem could not only cause complete vehicle failure (loss of power steering and brakes) at any speed, but also that the possibility of a spark inside the gas tank is not out of the question. This is an obvious manufacturing defect and is not limited to only our car. The wires were damaged due to the way the fuel pump was assembled within the gas tank. Other wires also show signs of wear, but are not yet worn through. An investigation revealed that a wire to the fuel pump inside the fuel tank had its insulation worn off down to the bare wire, and had shorted out. The mechanic suspected a problem with the fuel system. The engine would run roughly, stall, and surge, but the problem was intermittent, and gradually became worse. The fuse to the fuel pump repeatedly blew, but no other problems were evident each time the car was towed to the garage. ![]() Over the past two months, the vehicle stopped dead in traffic 5 times at various speeds with no advance warning. We believe this is the same problem that the Ford motor company identified for the 2000/2001ford focus program 03n01.ġ997 Ford Taurus wagon. ![]() We had these same symptoms in Sep 05 odi number 10141907. We called the dealership the next morning and explained the symptoms and they replaced our "fb sender and pump asy" 2f1z-9h307-fb (replaced fuel pump) and our "in line fuel filter" yf1z-9155-CA(filter 1767). Each time she was able to make it to the side of the road, wait about 5 minutes and try to start the vehicle (didn't always start at first) she was able to travel only a couple of miles. She called a tow truck to take our vehicle to the dealer. It happened five more times as my wife was driving before she could get into a safe area. There were no indications there was anything wrong with our vehicle it just went into these symptoms. ![]() ![]() Driving along the interstate at 70 mph and the car started slowing down and lost complete power all the lights on the dash came on no gas pedal and no steering. ![]()
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