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2012 247LSV exhaust manifolds cracked?

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The boat has the 6.0, We have been fighting an O2 sensor error code for the last 2yrs, we have replaced them twice, new spark plugs & wires and it keeps beeping, now the dealer thinks the exhaust manifold is cracked and it’s letting water on the 02 sensor from an impeller that went bad 3yrs ago? But this error didn’t start till a year after that?  Could a mild overheat, I think it got to about 200-210 before we shut it down only cause damage to the manifolds and nothing else?  The boat runs great, we surfed for a few hours Sunday.  No bad smells, very smooth.

SPN 3217 FMI:5

SPN 4236 FMI:0


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I bought my 2012 used last year. Fought with these errors through half of the Summer. I luckily negotiated in a 90 day warranty on the boat from the dealer and they stood behind it. 

They replaced O2 sensors 3 times, both exhaust manifolds and the muffler. Continued throwing the codes. They finally ended up working with Indmar and installed a different O2 sensor as well as a tweak to the ECU provided by Indmar to work with the new sensors. I didn’t have any issues the remainder of the Summer. I’m crossing my fingers the issue doesn’t return this season. 

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  • 4 months later...

Finally got this fixed - took to another dealer and they replaced the 02 sensors once again, said the manifolds are fine, so far its working the last two weekends....................

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