New Battery - now having misfires

[breezy2087]

I have a 21 ST (62,000 mi - no mods/aftermarket parts) that I had to swap the battery on. Wasn't aware of the BMS so I drove my car on after swapping the battery. After I traveled about 45 mins on the insterstate, I got off and under low loads <2500 rpms, I started hearing this odd clattering noise. I know that the cross pipes can start to make noise at the accordians, so I thought maybe it was my time and I'd check it the Friday after Thanksgiving. I woke up the next morning and drove the car on the interstate another 40 mins - no issues while on the interstate. I get off on my exit and all hell breaks loose. I've heard rod knock and valve clatter before, which is what this sounded like. I had about a mile and a half to my destination, so I limped the car there and parked it. My oil pressure light came on during the limping. I checked my oil and it was pretty low, so I added oil. Then while running the car, the noise lessened a bit but my CEL came on and started throwing codes:

• P0300 - RANDOM/MULTIPLE MISFIRE (CONFIRMED)
• P0304 - CYL 4 MISFIRE (PENDING)
• P0305 - CYL 5 MISFIRE (PENDING)
• P0306 - CYL 6 MISFIRE (PENDING)
• P0019 - CRANKSHAFT POSITION - CAMSHAFT POSITION CORRELATION BANK 2 SENSOR "B" (PENDING)
• P054B - COLD START "B" CAMSHAFT POSITION TIMING OVER RETARD BANK 1 (PENDING)
• P054D - COLD START "B" CAMSHAFT POSITION TIMING OVER RETARD BANK 2 (PENDING)

I reset the BMS the next day later in the evening, according to the manual, after replacing the battery it states it needs 8 hours of "sleep" but doesn't specify if that is after swapping the battery or resetting the BMS.

I'm hoping this is just an electrical hiccup - not looking forward to swapping plugs/and boots around to troubleshoot.