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lambda sensors. Cleanable?

  02 Clio 172
Is it worth trying to clean my 1st lambda sensor? Will this have any effect if it is faulty or should i just buy a new one and save myself some effort?

Thanks all
  clio 1.8 8v
new one is probablly your best bet i cleaned mine up the first time took me ages and in the end the car wasnt running any smoother and the engine management light was still on. ended up buying a new one shortly after
  172 Ph1/Scooby MY00
Cleaning mine seemed to make it worse. I got a new Bosch one from GSF for £55 or thereabouts.