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Thanks Doc. I've cleared the fault using Guzzidiag, under instruction from Mark/Beetle, who also didn't recognise the code. It erased Successfully, and it hasn't re-appeared, so hopefully not vital, whatever it is/was. I did notice, while playing with Guzzidiag, that the RH Lambda sensor was reading 0mV, as opposed to the LH sensor, which had a reading, so it has obviously failed. I know these are disabled anyway using a beetle map, so it doesn't matter.. but maybe a clue to the mystery error code.