Question about GMC Envoy XL

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Poor gas mileage lean 02 sensor change twice though it was 02 con ector change pig tail nothin happen need emmissionnn please help

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Check to see if you migh have more then one o2 sensor.

Posted on Oct 08, 2010

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Sounds like you have a vacuum leak. Although, it could be bad o2 sensors. If the computer sees that the o2 sensors are showing lean then it will increase fuel flow to try to even out, which causes it to burn more gas.

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Need to know what the code 44 means for us Land Rover


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I have p2243, p0171, p0030 code on my 2005 hyundai elantra what does it mean


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P0030 Oxygen heater control circuit open or shorted to ground,this is a enhance code, You are going to spend time and money trying to diagnosis this 02 sensor, just replace it,when a 02 sensor fails the ECM defaults to a subsituted value 3_27_2012_6_12_26_am.jpg

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Poor acceleration and low gas mileage,smells rich at idle


You are off to a good start, MAF when it is contaminated it leans the vehicle out it doesnt make the car run rich, depending on the fuel strategy of the year make and model,and of course the engine size make all the difference,bad ignition coil make a car run rich shorted 02 sensor that lean bias make the car run rich, worn timing belt ****** timing and causes the car to run rich.so lets hear the results

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Correct fuel pressure in lbs for a 2000 dodge durango 4x4 5.9 ltr engine


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Also, if fuel pressure is the cause of your problem, there will also be other indicators....

First, it will most likely set "lean oxygen sensor" codes in your computer. Also, your fuel trims will be skewed - I would recommend taking a look at that as well. Skewed fuel trims, poor fuel mileage and hesitation, loss of power, can also be caused by a dirty or defective mass air flow sensor.
Another possible cause of poor fuel mileage and poor acceleration is a restricted exhaust.(Bent or crushed tail pipe or a clogged catalytic converter.)

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Will a bad oxygen sensor give me bad gas mileage in my 07 pacifica with the 4.0L engine. Will hhoking it up to a computer give me any indication that it is bad.


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We have replaced our 02 sensors twice initally it


Having owned and thoroughly enjoyed an 01 Durango SLT plus for 6 years, congrats on having the "D".

How many miles on your D? Aging O2 sensors can cause mileage to drop. Which engine do you have? The 4.7 or the 5.9?

You will pretty much find that 11-13 mpg in town is the norm, and 17 is normal for hwy cruising. Towing though in either case will have quite an effect.

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1 Answer

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If you suddenly are getting poor gas mileage your O2 (oxygen) sensor may have failed. The O2 sensor helps dictate how rich or lean the fuel mixture is. If it fails the engine's computer defaults to a rich mixture so not to burn a valve or run too hit. This can be checked and if need be easily replaced. And yes if the van is over-do for a routine tune-up this is always a good investment. Make sure to check the air filter too, if she's dirty the engine will starve for air and get poor mileage.

I hope this may have assited you,
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4 codes P0171,P0174,P2195,P2197


Hi
171 system too lean
174 system too lean
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2197- 02 ozygen sensor signal stuck lean Bank 2
Sensor 1
The 2 front 02 sensors are located on the front of
the exhaust manifold.
Should solve problem and increase gas mileage.

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