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a few suggestions-
1 If it is buring oil that could affect your emissions now and again- no easy solution. If the engine is old - high mileage then this is to be expected Im afraid. If the car has just been serviced and the engine oil changed then it could be the engine is just worn. In a worn engine oil is coming past the piston seals and is being burned in the combustion chamber and will cause emissions probelms. Engines are designed to burn only clean petrol . Solution replace piston seals- meaning take the engine apart and replace the seals and if you do that you might as well do a few other repairs whils the engine is in bits- expensive.
2. If is running rough after a main service take it back and tell them to fix it. It should be running better not worse after a full service!
3. New lambda sensor- good idea and it may have been necessary but if you are burning oil then that is the big problem.
4. maybe just needs a good tune up? at a good garage. Have the engine checked by a good mechanic.
good luck
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