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?

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

 

Check your coils, see if the misfire follows the coil swap, if so get a new coil, start trouble shooting one code at a time. Don't get frustrated yet. Check your battery voltage also, seeing as the code came while in operation i dont suspect this is the issue.

 

My google search came up with:
C0300 = Fuel rail pressure sensor malfunction
C0700 = Engine oil temp sensor malfunction

A battery issue or other electrical issue can cause all sorts of problems on a Mini. It is good that you pulled all the OBD codes. But, you really should grab a Mini specific code reader to check for other manufacturer specific codes that might be stored. The Mini codes will help you narrow down the root cause of issues.

https://www.ecstuning.com/b-schwaben...020sch01a~scf/

 

Thank for your reply, but:

Thanks for the link to that scanner, njaremka. $230! I guess I can return the coils and get that...

 

Buy the Foxwell NT520 or NT530. You'll save $100 off the Schwaben for the exact same product

 

Great, thanks! Even $130 seems like a lot for a code reader, but it looks like it'll get a lot of use when you're a German-car owner.