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You replaced the intake gaskets - the code indicates "lean" condition which could be a bad upstream O2 sensor or vacuum leak. One suggestion would be to get a water spray bottle and spray all of the intake locations while monitoring the tachometer. Watch for RPM drops or engine hesitation. The smoke test is good for pressure leaks..water is better for intake leaks like cracked manifolds etc. Get a scanner and data stream the O2 sensors to determine lean/rich condition and ensure the upstream sensor is actively cross counting while running.
Do a full inspection of your exhaust system. Preferably on a lift while running. I have a 2015 Note SV and had the same exact issue. Apparently (and everyone reading this will agree) that Nissan exhaust systems are cheap and become porous. I replaced my entire exhaust ( well from the manifold on down) and lo and behold! All my emissions related codes are GONE! I found little pin hole along all the seams and welds…the system cost me $600 and some change from Rock. I saved a coupling hundred bucks by using a Walker 46 State compliant CAT, I’m in New Jersey so the Federal Cats are legal and now at 188,000 miles my blue Versa is my reliable weekend “Home Depot/Lowes/ Get ‘er Done” Beater. Good luck , I’ll keep reading to see how you make out.
 

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Its been 4 days driving the code p0171 is not showing up anymore and thank you all. I replace the fuel pump assembly my car start the engine on 1st try even its cold weather!
Great I’m happy to hear it. Hey maybe you can help me now…I replaced my Fuel Pump Unit about a year ago and I even bought the special tool from Amazon to remove the lock ring. The best $25 I ever spent. Saved me scrapped knuckles, time and headache. BUT!!! for the life of me I couldn’t get the new replacement green “o” ring on, I just couldn’t compress it enough, so I reused the old ring, works fine, tight no leaks, no odor, good seal so I feel safe. How did you get the new o ring on or did you reuse the original like me? Thanks, MyBlue2015.
 
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