Its been a long time since anyone posted here but I am having the same issue with my stillen kit on my 350Z. I saw that some folks have replaced the extension harness' and the issue went away. I just ordered them today in hopes to fix this issue. Brutusvk, did you ever get you P1239 code to completely go away?
Last edited by Lucas08'Nismo; 10-20-2015 at 09:40 PM.
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