Fluctuating temps checklist - 1. Debris in inlet side of trans cooler. 2.  As noted air leak on inlet side,  3.  Malfunctioning thermostat,  4.  Circulation pump impeller failure.  5. Clogged or loose water strainer,  6. Shredded raw water impeller or leaking O ring (air leak). 

Hopefully this would apply to you where ever you are but it hit my email this morning.

Hi, I recently got the same code.  Did it turn out to be a bad O2 sensor?

On 6/3/2024 at 11:18 PM, teamerickson said:

Phone volume all the way up?

LOL I did that once too

Parts are on the way for all of that, and when I looked up I believe it was 206 degrees. Impeller was replaced towards the end of last season but have another on the way. Went back and ran the code scan again last night after I got back home with the boat on a fake lake.  I have 8 inactive codes showing. 
 

-oil press spn 100

data valid but below normal range

-crank signal spn 636

data erratic or incorrect

-mhc failure spn 65581

bad intelligent device

-cyl 1 misfire spn 65591

mech system not responding

-etc pps2 range spn 65604

data erratic

-etc pps1 range spn 65605

data erratic

-etc pps1 range spn 65605

bad intelligent device

-etc pps12 correlation spn 65613

data erratic

During the code read the boat ran fine on the fake lake. I’m working today so I won’t have a chance to get it into the water until tomorrow evening to see if it goes into limp again and what codes reoccur.