Question about 2003 Pontiac Grand Am

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Getting code p0171, can anyone give me an idea what the problem coould be? I'm thinking o2 sensor.

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It means the system is running too lean. You may have a manifold leak, or something along that area. It would have to be diagnosed to determine why it is running too lean. Not something you can just guess at. You need to look at the information on the scanner and compare it to the base for that motor in order to determine if there is a sensor that is out, or something mechanical like an intake gasket. (For instance I would be watching the fuel trim on the scanner while someone sprays carb cleaner around the intake and vacuum lines and watch for the lean number go to rich when you come to the leak. sometimes it is just a crack in a vacuum line.

Hope this helps.

Posted on Sep 06, 2009

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I have a 96 Toyota Tacoma after the check engine light came on bought a scan tool. After scanning it it gives me a P0171 code, manual says that the system is too lean, I don't know where to begin.


A P0171 means that your Toyota is having trouble with a dirty or faulty mass air flow (MAF) sensor, or a vacuum leak downstream of the MAF sensor but this code can also signify a bad O2 sensor in the exhaust on bank 1.(the one closest to the engine on bank 1)
Also, P0171 code can be tripped by a plugged fuel injector, by a dirty fuel filter causing low fuel pressure, or even an exhaust leak before the first O2 sensor.Most of the time, the best way to respond to a P0171 is to try cleaning the MAF sensor and the lines running to and from it. This will often resolve this issue.Next is change the oxygen sensor in bank one and closest to the engine.

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1.4L turbo CEL P0171 P015B P1101 replaced bank 1&2 o2 sensors MAF sensor and all 4 spark plugs idles at 700rpm now roughly getting 20mpg instead of 48mpg anyone have any ideas?


There is no code P015B. Also you may have a actual lean condition and there was nothing wrong with the old part. Check for engine vacuum leaks while you monitor the output voltage from the O2 sensors. 1.0 volt is very rich fuel, .25 Volt and lower is very lean. The sensors should go back and forth with an average voltage of about .55 volts.

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2001 GMC Yukon XL idles rough and lacks power code out P0171


P0171 is a lean Oxygen Sensor code. It is trying to tell you that your engine is running lean...not getting enough fuel, or getting too much air. That will cause the poor running and dying. This is most likely caused by a bad vacuum leak. The O2 heater code is probably caused by a failed O2 sensor heater. Sometimes it is caused by an open or short in the O2 sensor circuits, but most of the time it is the sensor itself.

Jan 22, 2013 | 2001 GMC Yukon XL

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Replaced 02 sensor with code 131 and 171 now getting p0053


Code 53 is for a problem with the heater in the O2 sensor for bank one sensor one. It could be something in the wiring or you could have a defective sensor.

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1 Answer

CHECK ENGINE CODE p0171


P0171....System too Lean (Bank 1)

suggest you check O2 sensors on bank 1 ,their are two sensors one before and one after the cat ,think it may be the rear one playing up ,use a automotive meter to test them .

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I have five codes P2237 P2196 P2271 P0030 P0171 and a P2237 pending code on a 2005 elantra.The car runs poorly, bad gas mileage, sluggish with the check engine light on.Are all O2 sensors bad or maybe the...


P2237 P2196 P2271 P0030 P0171

These are all O2 sensor trouble codes, except P0171 which is a fuel trim code,

You have a bad 02 sensor - up stream - Bank 1 Sensor 1.

Replace it, then road test. The engine computer has a 'default' fuel trim it uses when an O2 sensor fails so it can protect the catalytic converter. If this hasn't been going on too long, good chance simply replacing the O2 sensor will remedy your problem.

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1996 dodge dakota black smoke, engine running horrible getting P0171 code?


It sounds like your engine is running very rich yet the computer thinks it's lean. P0171 is a lean code for bank 1 (the side of the engine with cylinder #1) Pretty much the only causes could be a large exhaust leak, bad o2 sensor or bad computer. Is the p0171 the only code?

Jul 31, 2010 | 1996 Dodge Dakota

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Service recommendation code p0171 p174 sytem too


2001 Buick LeSabre 3.8L V6 Check Engine Light come on after driving in 20 minutes,error code P0171.....O2 sensors and fuel filter changed ,how can I pinpoint the source.

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Trouble code P0171, P2195 Ford Focus


Even though your O2 sensor is showing good by your scan, it could be lazy in giving readings. It has less than a 10 second window to give the reading especially if it is a heated O2 sensor. Try a Bosch unit.

Aug 17, 2009 | 2003 Ford Focus

3 Answers

CODES P0171 & P0174 EMISSION SYSTEM SERVICE


if you have the 3.8 liter its more than likely bad intake manifold gaskets or a cracked manifold. Ford has had several TSBs on this issue. O2 sensors do not go bad as often as mechanics say they do. I have a 1999 that after 100 dollars at the parts store solved all lean conditions on the top end. The manifold has three parts to it. A lower aluminum that houses the butterfly blades for the variable intake runners( known vacuum leak were rods protrude at passenger side of lower bad bushings likely cause). Middle riser which uses oring seals which dry out and cause major vacuum leaks. upper is more or less the top cover which uses one large oring to seal. Hope this helps!

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