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2001 GMC Yukon XL - Page 6 Questions & Answers
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.
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.
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