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I've had those codes on my DME i think a while back when i was playing around with a potential DP fix for our cars...
The exact code was this...
2F8A - Ignition, voltage supply: Short circuit to B+ (The diagnostic function monitors the power supply wire providing voltage to the individual ignition coils from the overload-protection relay for ignition and injection, checking for open wires and shorts to ground)
These codes simply came up when the second O2 sensor was unplugged. It has nothing really to do with what the code suggests...
I tried to clear it using my procede at that time, but could not. So i used my trusty BMS CAN clear tool bought a couple years go and it cleared it right away. Then used the procede to reset the ECU and all was fine.
Try that and let us know.
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