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I have a 2009 Nissan Altima. Just replace the O2 sensor bank 1. Now I have this code P0171. There is a gas smell coming into my car. Do not know where the gas smell is coming from don't know how to fix the next problem. What do I do next. My A/F ALPHA-B1 is at 156%. What do I do next?
 

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Your new sensor is probably bad. Re-install the old one and see if the P0171 code goes away. When replacing sensors, always use Nissan OEM parts from a Nissan dealer; aftermarket electronic items generally are not reliable, don't last long, and many times are DOA.
 
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