The FIXD wireless OBD2 scanner and free app for iPhone and Android translates your check engine light into plain English so you can rest easy. In this video, we explain what OBD2 code P0171 means and possible causes.
P0171 means your engine is running too lean (too much air or not enough fuel) in bank 1 of your engine. Combustion engines run most efficiently when they maintain an air-fuel mixture ratio of 14.7 parts air to 1 part fuel. When there are more than 14.7 parts air to 1 part fuel in the air-fuel mixture, a lean condition exists and code P0171 is triggered.
The lean condition can be caused by a vacuum leak, which introduces more air into the air-fuel mixture, or by a weak fuel system, which does not input enough fuel into the air-fuel mixture. To keep the engine running properly, the powertrain control module (PCM) tries to compensate for the lean condition by injecting more fuel to the mixture in an effort to maintain the proper 14.7:1 ratio. When these adjustments become too large, code P0171 is triggered.

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0:00 P0171 - System Too Lean in Bank 1
0:09 P0171 is caused when the ratio of fuel to oxygen is off in Bank 1
0:29 Lean relates to ratio of fuel to oxygen
0:40 Power Train Control Module (PCM)
1:10 Possible Causes of P0171
1:51 Visit our blog to learn more about P0171
2:06 Happy Driving!

#FIXD #P0171 #checkenginelight