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 June 07, 2017

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

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

How does the automatic moon roof work?

moon roofs are great – they let in light and air, and they make your car feel larger than it is. Your car’s moon roof offers simple operation, but there are a few things you need to know before you...

How do I use the ParkView rear back up camera?

The ParkView rear back up camera gives you extra vision when backing up. The camera is located on the rear of the vehicle, to the left of the trailer hitch. When you put your car in REVERSE, the ParkView system...

Sunroof stuck open

Hello, thank you for writing in. The first thing you should do is check your owner's manual for more information on how to close the sunroof in cases like this. To repair the issue, we need to look at the...

Related articles

2012 Honda Civic vs. 2012 Ford Focus: Which One Should I Buy?
One of the best ways to cope with pain at the gas pump is to look at downsizing your vehicle, and today’s compact cars are a great option that allow you to keep the space that you need to move...
2012 Chevrolet Traverse vs. 2012 Toyota Highlander: Which One Should I Buy?
Large SUVs are a huge and broad market, with a range of different offerings from economy to luxurious. The majority of the SUVs and crossover SUVs offer decent gas mileage, plenty of room for friends and family to ride along...
A Buyer’s Guide to the 2012 Ford Fusion Hybrid
The The 2012 Ford Fusion Hybrid is a really great choice for anyone looking for a mid-size sedan. Not only does it boast plenty of room for people and cargo, but it also has a good amount of power and...