![]() It’s more likely to cause P0171, but it can happen. Verify they are tightly sealed and leak-free. Take a look at all the vacuum and PCV hoses.If not enough air gets into the engine, P0172 can appear. Check the air filter to ensure it isn’t filthy or something isn’t nested.When your Vue’s engine is running, do you smell gas? If you smell a strong odor of gas while the engine is running, it can be caused by a leaking injector or a fuel regulation issue. P0172 rarely appears alone (if it does look for a vacuum leak, bad O2 sensor, or dirty MAF). Other codes can provide valuable insight into what’s going on with your Vue. We recommend checking your vehicle for other codes first (so you don’t go in blind) and starting with the easiest stuff first. There are a number of potential causes of P0172 in the Saturn Vue. How to Diagnose and Fix P0172 in the Saturn Vue Air Filter– While it’s not the most common reason to throw the P0172 code, a clogged air filter can cause the code to throw.If your Vue’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 Vue’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. ![]()
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