Out on lake - active fault

[BrewKaiser]

Out on the lake getting StFT 2 high limit fault
SPN 4238

Any ideas?

[BurnMac42]

I think that's a o2 sensor..

[freeheel4life]

The 3000 series codes are o2 codes ie 3266, 3216 etc... BUT its probably throwing that code because the o2s are getting wet and feeding incorrect inputs to the ECM which in turn is trying to make output decision for injectors which are outside of its programmed parameters. ECM is trying to make the engine run at stoic and it keeps changing injector pulse time because its seeing lean or rich condition from the precat o2.

[Germaine Marine]

check bottoms first, takes 2 seconds to do. If wet, its not a matter of putting new ones in. The alignment is really far off at the Y/Rubber boot. Its a 50 50 shot you can align it without screwing up the crush gaskets at the manifold but I wouldnt do it expecting that result. If the lowers are dry check the tops. If those are wet check and make sure that the bulge in that rubber boot is seated perfectly you shouldnt need to loosen the lower manifold sections if its just a smidge off in that case but it could go either way.

If all are dry, you are lucky. Replace the bad one and you are good to go

[BrewKaiser]

Thanks all. We were able to determine it is an O2 sensor issue and continued our day. Albeit, I did notice more pronounced exhaust smell.

It’s likely the lower sensors. One of the tabs on the flowrite fill elbow to the port PNP bag broke off flooded the port locker on Tuesday. Thankfully I caught it in time but certainly disconcerting seeing that much water come out. Lesson learned is always fill PNP with rear locker doors open and carry a spare 1”to1-1/8” flowrite elbow.

As far as sensors go, it’s going into the shop for this and other warranty issues. I’m spending a LOT of time at the service department lately and not happy about it. Super Air Nautigue G25 looking awfully tempting right now