Replacing the fuse resolved the issue... Fuse blew again after about 10 minutes of driving. Replaced it, and blew again after another 10 minutes.
Looks like I'll have to poke around and check out the O2 wires for faults. I'm thinking I have a bad O2 sensor though, as I protected the wiring pretty well when I installed the Belanger pipes 2 years ago.
Gen4? $40 Parts Geek, Bosch 15-511I'm going to pull the sills next weekend, I just don't have time to do it any earlier. When I put in the new pipes, I made sure to wrap the O2 wires with fiberglass headder wrap pretty thick & banded with metal zip ties. I also "tweeked" the heat shielding to prevent a sharp edge from rubbing the wrap. I *really* doubt that has givin out, but to get to everything the sills gotta come off anyway so we'll see.
If I have to replace one, I'm just going to replace them all. Anyone have a quickie cost on the O2s?