How can I clear error code 203 - O2 sensor error

[Martincfi]

I have a 2018 AR240 and I keep getting the check engine light with Error Code 203 — 52 1107. I replaced the post cat O2 sensor but the error code won’t clear. I’ve cycled the battery switches, disconnected batteries too. Seems like the error code comes on shortly after engine start or anytime I accelerate from a low rpm setting. Boat is running fine and all 4 O2 sensors have been recently replaced.
Any ideas on how to clear this code? I’m guessing that its a false positive but not sure what else I can do. Just trying to avoid a trip to the dealership. (An hour away and the boat will be down for several weeks).
Thanks in advance.

 

[Weeb]

I cleared mine somehow when I was trying to connect my CanDoo. The directions said to disconnect the port tach which you don’t have to do on 2017 with connext screen. I don’t know what actually did it because I was trying everything to get it to connect according to the directions. The candoo is the same price as getting a dealership to hook up to it so it’s worth the money. I had to get a pc too because I have apple stuff but it will have paid for itself the next time I use it.