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For the past 3 years my 2001 Audi A8 2.8 petrol has no problem passing MOT Emmission tests. Yet the EMS warning light comes on after about 200 miles driving. Audi diognostic tests indicate cat problems.
I have now replaced 2 cats (top manifold & lower inline) andeach time had the code reset. It has again just past the MOT Emmision test. Now after driven a further 200 miles its back on again.
How many cats are there ? The cars performance is not compromised and I am getting 27 miles per gal. Any Ideas ?

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