2003 Renault Clio engine management light on, diagnostics says problem with lan de-sensor however engine running great, garage say never had this before when engine running so well, cleared on diagnostics twice but keep coming back.

Check exhaust to ensure there is not a small hole anywhere could be faulty wires going to the lamba sensor an air leak in vacum pipes inlet manifold etc faulty maf sensor.The worste with this sort of fault when the car still runs fine then it can be a major task trying to find the fault unless you use equipment to do live data readings.