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Within 40 days same problem has happened. Why would that be if ecm was replaced?

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Ecm reprogramed but service engine soon light came back on within 40 days

Vehicle: 2012 Sentra 4 cyl 2.0

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Did you get the same code? The P0101 code is for Mass Air Flow (MAF) sensor and not for the ECM.

P0101 NISSAN - Mass Air Flow Circuit Range/Performance
Read more: https://www.autocodes.com/p0101_nissan.html

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