![]() ![]() If your SRX’s fuel pressure is too high, atomization doesn’t happen properly, and fuel will dump into the engine. ![]() Fuel Pump/Fuel Filter– Today’s modern fuel-injected motors need a lot of fuel pressure to atomize the gas properly.Bad Fuel Injectors– If you have one or more faulty injectors, they can richen the air/fuel mixture.If it has gone bad, the air-fuel mixture will be off, and the P0172 code will show. Mass Air Flow Sensor– Your SRX’s mass air flow sensor calculates the volume of air entering the engine.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 Cadillac SRX, a vacuum leak is one of the most common causes of the P0172 code.Here are the most common causes of P0172 in the Cadillac SRX: If your SRX 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 SRX’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 SRX will want a rich mixture at certain times (such as when your vehicle 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. SRX 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 means the motor is running rich.Ĭadillac SRX P0172: Quick Info Definition It’s not the most complicated OBDII trouble code to diagnose. This code number references a number given to you when you plug your vehicle into an OBDII scanner. A common trouble code with the Cadillac SRX is P0172. ![]()
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