Q: Car stutters and occasionally dies. Tripping po171 code running lean.

asked by on

Does the GM 2.2 ecotec have an MAF sensor? If not what should i look at to see why car is getting code po171 running lean?

My car has 155000 miles.
My car has an automatic transmission.

Your engine does have a MAF sensor, follow the tube that comes from the air filter housing to the throttle body. You should see a connector with 5 wires and that should be the MAF sensor.

The most common cause for the P0171 code is a vacuum leak. Check the tube from the air filter to the throttle body carefully for any crack that would let air in. If any air gets in through that tube it will not be measured by the MAF sensor and will throw up the P0171 code.

Also check the vacuum lines that attach to the intake manifold. If any are disconnected or broken they will need to be repaired as they will cause the same problem as a tear in the air duct. It is also possible that the intake manifold gaskets are leaking. They are just rubber o-rings. Over time they get brittle and will not seal anymore and will need to be replaced.

If none of these problems solve your issue you could be looking at a bad MAF sensor or a oxygen sensor that is failing. If you need more assistance with this, I would set up an appointment with one of the mechanics at YourMechanic. They can come to your home or office and diagnose and repair your stalling issue.

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. Car stutters and occasionally dies. Tripping po171 code running lean.

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: Car feels like it's floating

Hello, this is a serious issue, if something like that has change with your vehicle. The vehicle’s front suspension need to be inspected as soon as possible. I would seriously think about not driving till then. If you'd like, a...

Q: Car is running slow, what could it be?

If you already replaced the sensor then now it will need that connector you've mentioned. Replacing it may fix the code P0502. The code P1406 is for the EGR valve position, you would need to have the valve tested to...

Q: It lost power and now won't start

It sounds like the battery is dead from the alternator not charging. This would account for the gradual loss of power and why the battery is dead and you have no lights. Have the battery charged and tested. Afterwards, start...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...