What does engine code P0171 mean?

Answer

Engine code P0171 means that an oxygen sensor in bank 1 is receiving too much oxygen in the exhaust. The reason the code is triggered is because the downstream of the o2 sensor is showing a reading of an imbalanced air to fuel ratio. This issue usually does not cause any problems with driving but you could experience a lack of power, detonation, rough idle, and hesitation or a feeling of surging upon acceleration. Its a good idea to take the car to the mechanic to have it checked out and maybe obtain a tune up.
Reference:
Q&A Related to "What does engine code P0171 mean?"
Engine code P0171 means that an oxygen sensor in bank 1 detected a lean
http://www.chacha.com/question/what-does-the-engin...
1. Attach the scan tool and start the engine. Allow the engine to run to operating temperature. With the engine running, visually inspect the engine for obvious vacuum leaks. Listen
http://www.ehow.com/how_7148144_troubleshoot-p0171...
Trouble code P0171 means: Fuel System Too Lean - Bank 1.
http://wiki.answers.com/Q/What_is_the_fix_for_engi...
If you really want a good answer, you should post what kind of car. Year, Make, Model. Yes, they are "universal", but there are differences as far as diagnosing the problem
http://answers.yahoo.com/question/index?qid=200905...
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