Hi guys just bought a land rover discovery 2 4.0 V8 genuine 64000 miles on a 2001 year. Thing is while under acceleration the other day the engine light came on had this checked out and it came back with fault code 50 secondary air bank one. Question is what the hell is that and how do you fix it ? Also can it be driven safely as no loss of power at all? I had the light switched out but is flashed back up again.