Mini Cooper Forums - Mini Cooper Enthusiast Forums - Got the dreaded yellow half-engine warning, limp mode, and codes ahoy

Hi all. Got a 2013 Clubman here with about 70,000 miles. On the highway it started shuddering, displayed the half-yellow check-engine light, and would barely move.

Subsequent code check revealed P0300 and P0300 P. I've replaced the battery, spark plugs, and coils to no avail. I checked the fuel-rail pressure and it reads 60 PSI with a dial-type tire-pressure gauge (not the optimal tool, I realize); from that I conclude that it's probably not the fuel filter or fuel pump, although the filter is probably due for replacement.

Now a code check pulls all of these:

p0300 multiple cylinder misfire
p0302 cylinder #2 misfire
c0300 rear speed sensor malfunction
c0700 something MAF-related? Hard to find good reference on this
p0597 Thermostat Heater Control Circuit Open

I find it suspicious that all of these things are suddenly occurring at once; can an electrical disturbance cause spurious codes?

I don't know what to try next. Advice appreciated!