Hi

This car has no fault codes but is failing the emissions test,the lambda is at 1.065 and should be below 1.030 for the mot, there are no exhaust joint leaks no split breather hoses, but when first started it does hunt then settle, it has 4 o2 sensors the front 2 do not seem to switch very much on live data, t had a new coil/plugs and leads 2 months ago

Any ideas thanks paul