This is how mine went ...Originally Posted by R055IE
First time it failed and popped that code was just taking off at a set of lights then lost nearly ALL throttle, engine light came up, turned motor off then on and it was good to go, it drove fine for maybe a week, and then losing throttle at random times and motor cranking but not starting symptoms began showing up here and there and became more regular. Each time the valve code popped up, and then at later stages BOTH codes popped up.
This is when I just took the car to nissan as i still had stat warranty and within 20 minutes they diagnosed it as a relief valve.
Don't quote me on this. But my understanding behind this valve is, once it's cherry is popped , it can still withstand pressure up to a point until it completely fails / gets worse. It leaks and it leaks internally back into the return pipe so you can't see it leaking.
This is from what I remember the nissan "tech" explaining it to me back then... (back in 2014). Now, a lot of people consider nissan tech's knowledge with that of a fence post. But , I drove out of there with full power.
As to WHY I also got the P0123 code ( the one your getting ) at the same time * shrug * . But I never got it again since that valve was replaced. Mind you, I sold that car 4 years ago.
More importantly that this may NOT be your issue, but sometimes systems are known to have a domino effect and throw up random codes down the line...
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