It's strange one, got it back up and running over 12 months ago, runs perfect for 6 months or so, lambda light comes on , cleared it with battery disconnected over night last time.
This time , disconnected battery same as last time over night, light still on.
Took ecu out and disconnected battery , light still on when all put back together.
I don't know enough about obd2 stuff so am at a bit of a loss as to why