Question about 2000 Chevrolet Astro

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Losing gas mileage, left bank running lean

Gas mileage has gradually been dropping , check engine light comes on periodically and when checked says left bank running lean, acts sluggish at times but never a regular time for that

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  • madisonlarry Mar 16, 2009

    very helpful advice although how long should it take to notice a change in my gas mileage

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There are 3 oxygen sensors on your van. Left bank would be the front left. Try replacing it and see if that helps but remember to reset the computer. Where I work the sensor costs a little over $100.00.

Posted on Mar 10, 2009

  • EYETRY Mar 16, 2009

    Probably after a tank or two.

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Codes P2270& P2272 after oil change check engine light on drove under 100 miles both O2 sensors bad .Could shop have caused this somehow??? Maybe banging them or something ?


make sure they are plugged in tight Definition of Diagnostic Trouble Code P2270 Category: Powertrain Definition: O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2Note: This definition of P2270 is applied to all manufacturers

P2270 - O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2 Comments ' Add Yours
Possible causes
- Faulty Rear Heated Oxygen Sensor Bank 1
- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Exhaust gas leaks Help with this
When is the code detected?
The Powertrain Control Module (PCM) detected the HO2S12 sensor has reported a lean condition for an extended period during an intrusive test
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- High Fuel Consumption
- Excessive Smoke from Exhaust
P2270 Description
The Powertrain Control Module (PCM) supplies a voltage of about 450 mV between the HO2S high and low signal circuits. The oxygen sensor varies the voltage over a range from about 1,000 mV when the exhaust is rich, down through about 10 mV when the exhaust is lean.
The PCM monitors and stores the heated oxygen sensor (HO2S) voltage information. The PCMevaluates the HO2S voltage samples in order to determine the amount of time the HO2S voltage was out of range. The PCM compares the stored HO2S voltage samples taken within each sample period and determines if majority of the samples are out of the operating range.

Definition of Diagnostic Trouble Code P2272 Category: Powertrain Definition: O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 2Note: This definition of P2272 is applied to all manufacturers

P2272 - O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 2
' Add Comment
Possible causes
- Faulty Rear Heated Oxygen Sensor Bank 2
- Rear Heated Oxygen Sensor Bank 2 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection
- Exhaust gas leaks
What does this mean?
When is the code detected?
The Powertrain Control Module (PCM) detected the HO2S22 sensor has reported a lean condition for an extended period during an intrusive test
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- High Fuel Consumption
- Excessive Smoke from Exhaust
P2272 Description
The Powertrain Control Module (PCM) supplies a voltage of about 450 mV between the HO2S high and low signal circuits. The oxygen sensor varies the voltage over a range from about 1,000 mV when the exhaust is rich, down through about 10 mV when the exhaust is lean.
The PCM monitors and stores the heated oxygen sensor (HO2S) voltage information. The PCMevaluates the HO2S voltage samples in order to determine the amount of time the HO2S voltage was out of range. The PCM compares the stored HO2S voltage samples taken within each sample period and determines if majority of the samples are out of the operating range.
P2272 Information for specific makes
P2272 BMW
P2272 DODGE
P2272 FORD

Jul 30, 2015 | Cars & Trucks

1 Answer

Need diagram of where #2 plug is. got a code saying #2 is misfiring and left bank is running lean


This is the diagram for the 4.6 1998 Ford Expedition.( Notice the numbers 1-2-3-4 spark plugs are on the left side if you are facing the front of the vehicle.) Please rate my answer if you were helped.
Thanks


z

Mar 21, 2014 | 1998 Ford Expedition

1 Answer

Bank 2 sensor for a chryler sebring can i still drive the car for alittle bit


It should be alright for a bit. It will not cause damage. Your gas mileage may drop a bit. The oxygen sensor is there for the computer to adjust fuel requirements for the engine, called "fuel trim"-more precise measurement of the gas required to run at optimum.

Jan 31, 2013 | 2004 Chrysler Sebring

1 Answer

Why the check engine light comes on and off runs great


The check engine light is on to tell you the computer has found a problem that will affect performance, gas mileage, or emissions.
Such as the code 171 you asked about.
Code 171 is for the fuel mixture on bank one being too lean. The O2 sensor is telling the computer the fuel mixture is too lean and the computer can not make it rich enough.

Dec 13, 2012 | 2003 Toyota Highlander

1 Answer

Ive been having issues with my 2001 tacoma pre runner. The check engine light goes on and off. It read a P0171. I replaced spark plugs and MAF sensor. Light has not come back on again but engine still...


That code is P0171= system too lean (bank 1). The computer is reading a lean condition and is trying to richen up the mixture but is unable to fully compensate for the condition. That is why the engine is running so rich and you are losing mileage. You should be looking for an air leak in the intake system after the MAF, a vacuum leak into the intake manifold, or an exhaust leak at the exhaust manifold gasket or some where above the oxygen sensor. The O2 sensor is seeing excess oxygen that is unaccounted for by the MAF.

Feb 04, 2011 | Toyota Tacoma Cars & Trucks

8 Answers

1996 T100 Toyota, will not start when hot, will start when cold but the engine light is on. Code says LB running lean? Allready replaced converter and sensors.


First thing that needs to be checked is the abscence of spark when it will not start. Running lean could be a vacuum leak on the left side or perhaps a clogged injector. How does it run when it does start?

Nov 01, 2010 | 1996 Toyota T100

1 Answer

1997 Chevy 2500 3/4 ton van. What are the symptoms for a bad oxygen sensor?


poor acceleration,bad gas mileage,but on this vehickle the check engine light would come on as it has three oxegen sensors right,left bank,and after converter sensors.if there is a problem the check engine light would be on?

Feb 14, 2010 | 1997 Chevrolet C/K 2500

1 Answer

Check engine light on code 171and 174


Sounds like a dirty Mass Air Flow sensor.

Mar 26, 2009 | 1997 Lincoln Town Car

2 Answers

2000 nissan quest, service engine light on, idles rough...


sounds like it , the sensor should be on the exhaust somewhere,whith wires on it

Jan 06, 2009 | 2000 Nissan Quest

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