Q: I have a 2012 chevy cruze my and I have a code that popped up p0171 for system lean bank 1 what could it ?

asked by on

I have a p0171 code for system to lean bank 1. I cleaned the MAF sensor and the permanent code went away but now popped up again as a normal code I don't know if I have bad o2 sensor or vacuums leak. I don't know how to tell if the o2 sensor is bad or if itfs a vacuums leak

My car has 97144 miles.
My car has an automatic transmission.

A number of things may cause code P0171 to be triggered. As the code indicates, this means there is a lean fuel condition which may be caused by a lack of fuel supply or in some cases, a vacuum leak. When a vacuum leak is present, this introduces an excessive amount of air into the fuel/air mixture which results in leaning out the fuel content. Other problems such as a faulty fuel pressure regulator, a faulty fuel pump, a clogged fuel filter, faulty fuel injectors, faulty oxygen sensors, or a faulty mass air flow sensor may also cause this to happen. I would suggest having a professional from YourMechanic come to your location 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. I have a 2012 chevy cruze my and I have a code that popped up p0171 for system lean bank 1 what could it ?

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: How do I personalize the language settings?

You can customize many of your vehicle’s settings using the vehicle personalization system. One of the settings that you can customize is the language. Your vehicle has three languages it can operate in: English, French, and Spanish. To customize the...

Q: What type of gas should I use in a 2012 Honda Accord?

Many engines are designed for a specific grade of gasoline (octane). Octane ratings start at 87 and range higher. Your car should use at least 87 octane unleaded gasoline (no diesel!). Higher octane fuel is usable, but not necessary. However,...

Q: Can an oil change cause my gasket cover valve to crack?

There is a possibility the valve cover gasket had a weak seal and began to leak. The exhaust manifold is mounted just below the valve cover on one side of the engine, so leaking or spilled oil may come into...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...