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Code P0174 (Symptoms, causes and how to fix it)


Combustion engines are not machines that can be tuned perfectly and expected to run that way forever. They require constant readjustment to function effectively. Modern car technology works to make these precise adjustments while you drive.

Sometimes even the most advanced systems cannot correct a problem that develops in your engine. When the problem is more than its automatic correction systems can handle, the check engine light comes on and the vehicle’s computer stores a code.

A P0174 code indicates that your engine is running poorly in bank 2.

The term “lean flow” means that there is too much air and not enough fuel being pumped into the chambers. The other problem is called “getting rich.” Enrichment occurs when there is too much fuel and not enough air.

Bank 2 describes the side of your engine block that does not contain the number one cylinder. This bench on the driver or passenger side of your vehicle depends on the manufacturer. Check your owner’s manual to find it under the hood.


What does the P0174 code mean?

P0174 OBD-II Trouble Code Description

About the Ghana System (Bank 2)

A P0174 code indicates that there is too much air or not enough fuel entering the second half of the engine block. As a result, the air/fuel ratio inside the engine is not correct. Most vehicles require a balance of 14.7 parts air to 1 part gasoline as the optimal air-fuel ratio.

When your car registers a P0174 code, it means that the discrepancy between the amount of air and gas entering the engine is so large that your fuel injectors cannot permanently fix the problem. A bigger problem occurs that a small intake of gasoline cannot solve.

Often, a P0174 code indicates a vacuum leak or a problem with the fuel pump. Running the engine for an extended period of time may cause overheating, dry running, or other internal damage. P0174 is not a code to take lightly or ignore.

Related: Code P0171 (Ro-Ghana System, Bank 1)

Code P0174 Symptoms

Any time your vehicle is running at low rpm, you will experience a rough or high idle. There may even be problems with the engine, such as:

  • strong cough
  • Spray
  • Lost

If you notice a loss of power or sudden increases in power while driving, this is another sign that your engine needs more fuel and less air. A narrow-running car can sometimes stall or stall.

Most symptoms worsen at lower speeds or RPMs. When driving fast, the engine requires a higher air/fuel ratio. Therefore, at higher speeds, the engine does not have a much lower fuel to air ratio.

Causes of Code P0174

To throw a P0174 code, part of your engine is letting in too much air or not pumping enough fuel. In rare cases, the sensor may be defective. However, a vacuum leak or fuel pump problem is the most common culprit.

absolutely crack or leak in the vacuum system, allowing excess air to flow into the engine. When your car displays the P0174 code, the leak could be in the positive crankcase ventilation (PCV) line or the connection between the vacuum hoses and the PCV valve.

Low fuel levels come from the fuel pump or fuel injectors. If the fuel pump is weak or malfunctioning, it will not push enough gasoline to the engine.

Likewise, if your fuel injectors are clogged or faulty, they cannot maintain the correct air-gas ratio. A clogged fuel filter will also prevent the correct level of gasoline from entering the engine.

If your vacuum system is not leaking and you know that your engine is getting all the gas it needs, you will need to check the sensors. You may have a faulty mass air sensor, oxygen sensor, or air-fuel ratio sensor.

Is code P0174 serious?

A P0174 code may indicate a serious problem. Even if the root cause itself is not critical, running the engine without enough fuel will cause other problems. You must act quickly to remedy the situation or expect increasingly costly damage in the future.

If the problem is not corrected, you risk overheating your engine. If your car sits still for a long time, you run the risk of a blown head gasket, warped cylinders, or related problems that make it impossible to drive.

How to fix

To clear a P1074 code, you must do whatever it takes to get the correct ratio of gas and oxygen flowing through your engine.

First, fix any leaks or vacuum problems with your PCV. Both contribute to excessive airflow in the fuel lines.

Second, check your fuel system. Make sure the filters and injectors are not clogged. Make sure the fuel pump and fuel pressure regulator are working.

If your car still shows the P1074 code after rescanning with an OBD2 scanner, check your sensors in the area. The mass airflow sensor, oxygen sensor, and air-fuel ratio sensor are affected by this trouble code



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