Skip the auto shop - Our mechanics make house calls

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.

A: Your engine does have a MAF sensor, follow ...

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?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Weird smell coming thru a vents

White smoke through the vents can indicate a leaking heater core. Coolant circulates through the heater core which is behind the dash to provide heat. If no coolant leaks are obvious under hood, the heater core may be your culprit....

Q: Hear rattling under the hood

Hi there. Many components make up your cooling system. If any of these components are not functioning properly, it will cause your vehicle to overheat. If your vehicle is not leaking any coolant chances are that your radiator fan(s) are...

Q: Rear suspension creaking on a '02 Mercedes C180

The problem is that, since it's a Mercedes-Benz, they used to make cars with grease fittings. Now there are no grease fittings, but just rubber bushings and metal pieces. Your Mercedes is 13 years old. As they get older, that...

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...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...