My ETS light comes on for a couple of weeks then goes off again for a week, been doing this for past 4 years. Codes show it's the post cat sensor which has no effect on the engine, it's only there to warn there may be a problem with the cat.
Last 4 MOTs indicate the cat is fine so I've left it as the sensor ain't cheap.
If the light is on there will be a fault code, just check what the code is and post on here if you have any doubts.
John
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2000 V70R AWD - SWMBO 2017 XC60 D5 AWD --- Previous - 2009 V50 D5 SE LUX - 2000 V40 SE 2.0 - 1986 760 GLE 2.8
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