Q: Running lean on bank 2

asked by on

code p0174 to lean bank 2

My car has 275060 miles.
My car has an automatic transmission.

Hello and thanks for writing in. Code P0174 relates to a lean fuel condition which is typically caused by a faulty mass air flow sensor or potentially a vacuum leak beyond the mass air flow sensor causing the reading of the mass air flow sensor to be inaccurate. The mass air flow sensor reads air intake as it is mixed with fuel prior to being injected into the motor. This information is then sent to the ECM which uses this to make adjustments to fuel supply to the motor. A dirty or faulty sensor can cause an imbalanced air/fuel load to be supplied to the motor which results in an over fueling or under fueling situation depending on the conditions. In your case, it is causing a lean condition which means the ECM is not supplying enough fuel to the motor. I would suggest having a professional from Your Mechanic come to your home to diagnose and inspect your vehicle.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Running lean on bank 2

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Possible blown head gasket issue - 2008 Ford F-150

Hello. If it has a blown head gasket it can be quite the undertaking to fix this. You would need to remove the cylinder heads and have them fully rebuilt prior to reinstalling them. If you have a lot of...

Q: What is causing my vehicle to "roar" when I turn right?

We need to start by addressing the repairs that were just made. If the noise started after the brake replacement, there is a strong possibility there is a correlation between the two. Think about the components that were just worked...

Q: Q: Car won't start

Hi there, thanks for writing in. Quite often when the vehicle runs out of gas, especially on electronic fuel injected vehicles, the fuel pump may not have the required pressure to deliver gasoline to the fuel rail. In most cases...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.