I have an 03 G35 coupe and i'm throwing a 0021 code. I have changed the oil, changed the ivt control solenoid, cam, and crank sensors. I'm still throwing the code, and don't know why. I have a built motor and the PE TT kit. The only thing i can think of it might be is i have a blown head gasket but don't know if that would even relate to my problem. Can anyone help me???

 

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