Question about 2001 GMC Yukon XL

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

Code P0171

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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.

Posted on Jan 22, 2013

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Posted on Jan 02, 2017

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SOURCE: light replacement

Just reach behind the bumper and grab the light/electrical harness and twist is either way and then it should pull out put in a new 194 bulb and you are set.

Posted on Jan 08, 2009

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SOURCE: check engine light on 2004 GMC Yukon XL

Code po449 is the canister vent valve solenoid error.This is a common problem with these valves because they are under the truck in the rear by the spare tire and they get all the dirt and water and snow,if you live in an area where you get snow.You will find it on the canister under the vehicle by the spare tire.

Posted on Nov 18, 2009

Molson02536
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SOURCE: 2001 gmc yukon xl key in ignition won't turn to

The tumblers in the ignition lock may be seized, try cleaning it out first with a small spray of WD40 and try the spare ignition keys. The keys it self may be too worn down for the tumblers in the lock and if you have lots of other keys on your key chains, this will promote the lock to wear out quicker. Good luck and hope this helps and try turning the steering where back and forth as you try to turn the ignition key.

Posted on Dec 13, 2009

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SOURCE: P0101 p0171 p0174 engine codes

Those are lean codes and a MAF (P0101) code. Make sure the MAF sensor is plugged in, and there are no leaks/ loose hoses between the air filter and the engine. You may have a vac leak at the intake also, but check these first, If all appears OK a repair shop will need to check it out for you.

Posted on Dec 16, 2009

SOURCE: i have an engine code PO332 knock sensor 2 circuit

The most likely cause of your code is a bad rear knock sensor. You should check the knock sensor wiring harness for corrosion. But if that checks out the sensor will have to be replaced. The knock sensor is under the intake manifold, although it's not too difficult to remove. Both knock sensors should be replaced along with the wiring harness, just because of labor involved in gaining access to the sensors. You could try clearing the code, it may stay off for a long time.

Posted on May 23, 2010

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P0171 and p0174 GMC YUKON XL 2004 5.3 1500


These codes let you know the engine is running to lean on gasoline . May be only a plugged fuel filter or weak fuel pump. A vacuum leak can cause this problem . The engine controller may need reprograming with new software. Dirty fuel injectors. Try adding fuel conditioner to the gas tank and changing fuel filter.

Feb 15, 2017 | 2004 GMC Yukon XL

3 Answers

P0171 and p0174 codes in memory. I had a tune up and a 4th or 5th cylinder wa not firing. The tune up included new plugs and wires and a new coil for one of those cylinders..I drove over a hundred miles...


THIS IS WHAT THE CALL TRHOTTLE POSITION SENSOR WICH IS LOCATE ON THE SIDE OF THE THROTTLE BODY THIS PS CONTROL THE IDLE ALSO CONTROL OR MIX THE OXYGEN WITH THE GAS

Jan 04, 2011 | 2003 GMC Yukon XL

1 Answer

2003 GMC Yukon XL- We have the codes of P0174 and P0171 coming up. We have cleaned the fuel injectors, cleaned the throddle body. Had a new fuel pump put on a year and half ago. When you turn it on, it...


One of the things to look for is a vacuum leak, especially around the throttle body area. Make sure the throttle body gasket is not rolled and is seated properly. also check the PVC hose for leaks.

Sep 13, 2010 | 2003 GMC Yukon XL

1 Answer

My 2003 GMC Sierra idles rough and cut off sometimes when turning.Replaced fuel filter and changed plugs.engine light stays on.Which 02 sensors do i need to replace first? Before converter or after...


Before replacing the O2 sensors, I would check the fuel pressure. You may also try to have someone pull a trouble code from the powertrain control module to verify why the engine light is on. Do not replace any parts until this is done, otherwise your going to be guessing at the root cause, and it will get expensive with part replacement.

May 11, 2010 | 2003 GMC Yukon XL

1 Answer

2001 GMC Yukon XL 5.3L - Engine Timing


Doubt it. try a code reader. Sound like an emissions problem

Apr 06, 2010 | 2001 GMC Yukon XL

1 Answer

Please explain code P171 for my 2001 GMC Yukon XL


PO171 System to lean left bank. Lean means either not enough fuel or to much air. Might have an injector problem. Check plugs on that side, see what color the white porcelain part is.

Feb 19, 2010 | 2001 GMC Yukon XL

1 Answer

2003 Yukon, rough idle, extreme power loss,code PO300, miss firing. Changed plugs,wires, and fuel filter with no change.?????


My brother had a similar issue with his Ford F-150, he needed the fuel injectors replaced. Good Luck!

Sep 30, 2009 | 2003 GMC Yukon XL

3 Answers

2001 GMC Jimmy Idling rough


HI
P0300 is multiple misfires.
P0171 is lean burn on left bank 1 means drivers side
02 sensor is faulty. Your vehicle is over fuelling that is why your are getting P0300 code and the rotten egg smell. Good idea is to replace both 02 sensors.

Apr 04, 2009 | 2001 GMC Jimmy

1 Answer

PO305 Code on 2002 Yukon XL 5.3L


You probably have water in your fuel . Use some Stabil healthy dose and then some isopropyl alcohol gas line antifreeze that Will probably fix it . and fill it at a popular gas station , not a little station that only sells a little gas. Its either that or you might have a pluged cattalyitic converter. Try this site . http://www.obd-codes.com/forums/search.php?search_id=active_topics

Mar 07, 2009 | 2002 GMC Yukon XL

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