We just checked the exhaust no leaks. The front two sensors were changed out. Not sure where to look now. Once the code is gone it’s going for sale , I’ll definitely post it here. 2003 one owner 60230 miles absolutely perfect shape no road rash on rims interior is like new.have your mechanic check for hairline cracks in the catalytic converter. the early one had issues with those. the model of your rover is L322.
if you decide to sell it, please post it here so someone from the forum get a first chance to buy it.