Question

2010 Nissan Sentra with engine code P0171, I exchanged the O2 sensor, but 2 days later the same code was detected. Please recommend a solution

Answer 1

Hi there!

In most cases this code is caused by a lean fuel mixture. This is typically a vacuum leak after the mass air flow sensor or the maf sensor itself. If you use some carb cleaner with the engine running, you may feel the engine rpms increase. If this happens then you have a vacuum leak.

Answer 2

cheka que el maniful de escape no este agrietado,o el empaque del escape este malo,eso hace que te encienda la lus de chek ingene, porque al entrar oxigeno al escape este detecta como que el sensor esta malo.