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2012 247LSV, 410hp, Codes SPN:65676 FMI:11 and SPN65675 FMI:11

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I had a misfire throwing a code that I tracked down to failed plug (insulator broken off).  That code is still there and has not cleared but when I changed the plug and the engine is now running great, I get these other two codes.

SPN:65676 FMI:11, SPN65675 FMI:11

Both appear to be associated with the catalytic converters o2 sensors.

I'm going to change them out but did not take them with me as I don't keep the boat at home.

I took a picture of one of them which is a Denso 12589321.  It has a few other numbers under it as well.

Is this the right o2 sensor?  It was the only one of the 4 that had any markings so I think the dealer might have changed it a couple years ago.

Are all 4 o2 sensors the same?

Here's exactly how the numbers look.







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All four oxygen sensors are the same. When you pull them out check to see if they are wet. Also check to see if the cat brick is still intact. The 6.0 tube manifolds are a problematic manifold. 

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