Neo Posted September 3, 2024 Report Share Posted September 3, 2024 Boats MIL light came on, and the dreaded beep. 2023 Indmar 440 with 135 hours on it. First code was the 3271, which I think is a post cat o2 sensor. I swapped sensors on the post cat and got the 3261 almost instantly. weird part is the 61 cleared, but I’m still getting the 3271 fault. I’ve ran it WOT, disconnected batteries. was thinking about swapping the o2 sensors, but not sure there is a point or just take it to dealer. can’t find the exact codes online to identify what the issue is. Quote Link to comment Share on other sites More sharing options...
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