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Plagued by O2 sensor fault code P2a00


Bracey22

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Since buying my Z late August it has been back to the garage I got it from 8 times with the same fault code. They have tried doing nothing (cos that sounds like a good fix!?) messing with the timing and other ecu features, cross threading a pattern sensor (bank 1 sensor 1), and having Nissan fit a genuine sensor (as well as repairing my manifold). The check engine light is back on again, and I was hoping someone out there could suggest a most probable root cause? I gather that it could be fuel pressure or injectors or an air intake leak (least likely I think)? I have an HR engine. Any advice gratefully received!

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