holy crap dude, that sucks. I have the hondata reflash and have had a caspers O2 sim for even longer. No problems at all. It sounds like the sim was jacked up. I really have no idea how those things work, but if they try to tell you you cant use an O2 sim with hondata, they're bullshittin you. good luck bro!
by the way, which sensor did you put the sim on?
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