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Error code P0174 is an OBD-II diagnostic trouble code defined as “System Too Lean (Bank 2).”
It indicates via a lit check engine light that a lean fuel condition is detected by your Engine Control Module (ECM) on Bank 2.
A lean fuel condition is created if there’s too much air and not enough fuel in your air fuel ratio (AFR). Usually, this means that your fuel system isn’t delivering enough fuel for the combustion process.
Your Engine Control Module (or Powertrain Control Module) is designed to adjust your lean fuel condition back to normal when there’s too much air in your air fuel mixture, but only in small increments.
If your air fuel mixture requires greater compensation than normal, code P0174 may be set.
Many of the symptoms associated with error code P0174 are more noticeable at lower speeds and revolutions per minute (RPM).
If you have an active P0174 code, you may experience one or more of these common symptoms:
Note: Lean code P0174 code is very similar to code P0171. The P0171 code also indicates a lean fuel condition but refers to Bank 1.
Yes, you can still drive.
Generally, a lean code isn’t that serious. However, a leak in the air intake can let particles enter the engine and cause internal damage. Furthermore, a lean fuel condition can lead to friction between some of the moving parts in your engine and damage critical components.
So, it’s best to head to a professional mechanic and get this code fixed ASAP.
Here are some of the most common causes of the error code P0174:
Although you can diagnose error code P0174 yourself, there’s some specialized equipment needed for this repair job. So, it’s best to let a professional mechanic handle the diagnosis for you, to avoid doing any more damage to your car.
Here’s how your mechanic will diagnose the problem:
Note: It’s important for your mechanic to complete the entire diagnostic process before attempting any repairs. You don’t want to pay for a new MAF sensor when your O2 sensor is the root cause of the lean fuel condition.
Since several different issues can cause lean code P0174, there isn’t just one possible solution.
Once your mechanic has diagnosed the problem, here are some of the common fixes:
Before a mechanic can fix error code P0174, they’ll need about an hour of diagnosing time to determine the problem. Depending on where you live and the labor costs in your area, you can expect to pay $75-$150 for this service.
Once your mechanic has diagnosed the issue, the auto repair shop will give you a repair estimate.
Here’s what you can expect to pay depending on the issue:
Note: The repair costs above include labor charges.
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