Sounds dodgy if its intermittent,
I bought mine with the EML on, was told it was decat.
Drove it for a while and didn't bother checking it.
Finally got it on a cheapy scanner and indeed was the decat - it was reset and i've ordered an 02 sensor spacer.
Should be end of it..
But the thing with an engine light - it could be more then just one issue!!
It all depends on the price.
Is it cheap enough to gamble and do you have the experience to repair If needed.
Sold straight away - he who hesitates is lost. Never mind.... Next time!
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