Question about 2001 GMC Yukon XL
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
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
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
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
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
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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