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On Board Diagnosis Logic
WARNING: This page is about a different car, the 2004 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
This self-diagnosis has the one trip detection logic.
NOTE:
If DTC P0121 is displayed with other DTC, first perform the trouble diagnosis for the displayed other DTC.
Courtesy of NISSAN MOTOR CO., U.S.A.