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There are many things that can cause the P0174 trouble code on the Chrysler 300. Here are some of the most common issues:
Vacuum Leaks– With the Chrysler 300, the most common cause for the P0174 code to show is a vacuum leak. Take a look around and see if you can find the vacuum leak.
Mass Air Flow Sensor– The mass air flow sensor calculates the volume of air entering the engine. If it has gone bad, the air fuel mixture will be off and the P0174 code will show.
Bad Fuel Injectors– If you have one or more fuel injectors that have gone bad that can certainly cause the air/fuel mixture to go bad.
Fuel Pump/Fuel Filter– Today’s modern fuel injected motors need a lot of fuel pressure to atomize the gas properly. If the fuel pressure is not as high as it needs to be this atomization doesn’t happen properly and the optimal air/fuel mixture isn’t achieved. Unless you have a reason to believe this is the issue, don’t start here.
Bad O2 Sensors– There very well could be nothing wrong with the air fuel mixture at all. If the oxygen sensors are bad, it’ll erroneously throw P0174. In this case, the motor will begin to run too rich since the air fuel mixture was richened unnecessarily. This is often the cause of P0174. They are relatively inexpensive and easy to replace, and this often ends up being the problem.
Stämmer väl bra med de mer generella riktlinjerna för P0174;
Intake air leaks
Faulty front heated oxygen sensor
Ignition misfiring
Faulty fuel injectors
Exhaust gas leaks
Incorrect fuel pressure
Lack of fuel
Faulty Mass Air Flow (MAF) sensor
Incorrect Positive Crankcase Ventilation (PCV) hose connection
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