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If you have a code reader see what the conditions are of the code. On mine it was idle/startup and my code reader said it was a fuel performance issue. I would clear the code and then restart, no code. Shut off, wait a minute and then turn back on the the code would pop up on idle everytime.

After doing some R forum searching I feel it is either the FPS on the fuel rail or the internal fuel regulator on the pump. Since the FPS is much cheaper than a pump (if you get the LR part) I got that first and am about to install this weekend. Plenty of write ups on it if you decide to go that route.
 

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FYI, I swapped out my FPS this weekend and no more P0089 code.
 
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