Limp Stillen Supercharger dtc p1239

Rev_Night

Are you still using the stillen cables? Even with the heat shield, only 1 of the cables is insulated. Meanwhile, the OEM cables, 4 out of the 6 are. Trying switching to those

Edit: For the p0300 code, funny enough I did get one of those in the extreme (Polar Vortex) cold. My car started and drove fine btw, just that check engine light on. The shop said it was because they gapped the spark plugs closer than they could have to protect against premature ignition which can ruin the engine. They said the code would go away 1) In warmer weather or 2) After a few minutes of highway driving.

They were correct on both accounts. I've only see it just that once.

Edit 2: For what its worth, i have stock GTR spark plugs in my 350z (HR)