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Hey fellas, I just did I scan with my ODB 2 and I got these fault codes. What exactly do they mean and what should I look out for/inspect/prioritize fixing. I'm new to cars so I'm not sure where to start. Thanks.
Your first two codes indicate the ECU is seeing high voltage from the knock sensor and the fuel mixture is lean to a point it cannot compensate/adjust.
Both of these are not good and need to be addressed ASAP, as they can compromise the engine longevity. The knock sensor could be failing or has failed, and/or the wiring harness leading to it damaged. Check for vacuum leaks and clean/replace the mass airflow sensor. Check the PCV hose on the front of the plenum, the small hose on the rear of the intake plenum for cracks/tears, as well as the large intake boots/couplers leading from the air filter. BOTH the G35's I've owned had cracked intake boots I replaced immediately upon purchase, as well as needing new PCV hoses. Z1 and ConceptZ make affordable silicone replacements.
I'm unfamiliar with the other 3 codes you have, but they are regarding the immobilizer function. Did you get your keys replaced??
Last edited by andrewl_v35; Oct 1, 2020 at 01:39 PM.